CCopper pollution has attracted great attention from environmental protection agencies at domestic and international areas, due to its concealment, accumulation and irreversibility. As a new adsorption material, biochar has the characteristics of huge raw materials, environmentally friendly and excellent adsorption performance. However, in general, the effect of pristine biochar on controlling heavy metal pollution in water environment is limited. In order to improve the adsorption capacity of biochar, preparing modified biochars with high adsorption efficiency by loading different elements onto pristine biochar has gradually become a research focus. Impregnation is one of the main preparation methods of the above modified biochars. In this study, three kinds of different chemically modified wheat straw derived biochar were prepared as adsorbents for the remediation of Cu2+ pollution in soils and waters. The performance of these biochars on Cu2+ sorption in aqueous solution was investigated. The wheat straw derived biochar was modified with sodium silicate solution, Magnesium chloride solution, and hydrogen peroxide solution. Scanning electron microscopy combined with energy dispersive X-ray spectroscopy, Fourier infrared spectroscopy, and other technical methods were used to investigate the changes of surface morphology and functional groups on the studied biochars before and after modification. Sodium silicate modified biochar (SBC) had the largest specific surface area and pore volume of 43.69 m2/g and 5.3 cm3/g, respectively, which were increased by 6.25 and 2.79 times compared to unmodified biochar (6.02 m2/g and 1.4 cm3/g). The results of SEM-EDS showed that all the modified biochars presented a decrease in elemental C content and an increase in elemental O content, with the largest changes in elemental C and O content of SBC. While Si and Mg containing particles were loaded on SBC and Magnesium chloride modified biochar (MBC). The results of FTIR showed that, the peak value of functional groups can be enhanced by modification, SBC has the greatest modification effect.. In addition, the sorption kinetics of Cu2+ on BC, MBC, SBC and HBC can be expressed well by the pseudo-first-order model. Moreover, the sorption isotherms of Cu2+ on unmodified biochar, MBC, and SBC were found to be well fitted by the Langmuir model, while the sorption isotherms of Cu2+ on hydrogen peroxide modified biochar (HBC) were more consistent with the Freundlich model. According to the analysis of the sorption model parameters, SBC has a stronger sorption capacity for Cu2+ with a theoretical sorption amount of 230.20 mg/g among the three kind of modified biochar: MBC, SBC and HBC. The results can provide a theoretical basis for the treatment of Cu2+ contaminated water by modified biochars.