The invention relates to a soil remediation agent, a soil remediation material and a preparation method. The soil remediation agent is prepared from the following raw materials: biomass charcoal, vermiculite, zeolite, pyrite cinder, attapulgite powder, fulvate, ammonium carbonate and an additive. According to the soil remediation agent, through reaction of the biomass charcoal and the pyrite cinder, iron in the pyrite cinder is reduced, Fe < 3 + > and Fe < 2 + > can exchange with Si < 4 + > in zeolite, vermiculite and attapulgite powder, and therefore the cation exchange capacity of the obtained soil remediation agent is improved; moreover, the soil remediation agent can load more nutrient substances, the additive can be slowly released, and the soil remediation material prepared from thesoil remediation agent can effectively improve the air permeability and the water retention rate of soil.