Biochar, as a soil conditioner, can significantly improve soil fertility. But few data are available about impacts of biochar on salt leaching in saline soil. In this experiment, different rates (0%, 2%, 5%, 10%, w/w) of biochar prepared out of mushroom residues were added into surface soil layer (0~20 cm) of sulfate saline soil columns, separately, collected from Hetao, Inner Mongolia. Deionized water was added into the soil columns to form leaching and eluents from the columns were collected and analyzed for electrical conductivity (EC) and contents of some major salt ions, with a view to exploring effect of biochar on leaching of salts and ions from saline soil. Results show that eluents from biochar-amended columns appeared 5~36 days earlier than that from the control column, and the higher the biochar application rate, the earlier the eluent, the shorter the time for EC declining below 5 mS cm^-1. It could be shortened by 41~100 days. Biochar addition at a rate of 2% was the best desalination of the surface soil, reducing salt content by 34.25% as compared to CK. It is obvious now that addition of biochar can shorten the time of desalinization the soil and improve soil desalinization efficiency as well. However, no significant difference was observed between the effects of biochar leaching different salt ions in sequence and rate of leaching.