The invention provides a composite mineral soil repair agent, which is prepared from the following components in parts by weight: 60-75 parts of medical stone, 5-15 parts of zeolite, 20-25 parts of peat, 5-15 parts of pumice, 5-15 parts of bentonite and 0.5-1 part of microbial fermentation liquid, the repair agent is prepared from steps of material selecting, crushing, mixing, stirring, granulating, drying, checking and packing, the soil repair agent prepared by the invention can perfect soil quality, prevent soil compaction, regulate pH value and adsorb heavy metals to well perfect the growth soil environment of crops so as to beneficially improve the yield of the crops.