Biochar soil heavy metal repairing agent and preparation method thereof

The invention discloses a biochar soil heavy metal repairing agent and a preparation method thereof.The biochar soil heavy metal repairing agent comprises plant straw, sludge biochar and filler, during preparation, the plant straw and dewatered sludge are selected to be calcined respectively to prepare biochar, then components such as styrene-butadiene-styrene copolymer are compounded, and the biochar soil heavy metal repairing agent is prepared. The specific surface area is increased while the calcination effect of the biochar is ensured. According to the biochar soil heavy metal repairing agent and the preparation method thereof, the process design is reasonable, the component proportion is appropriate, the prepared heavy metal repairing agent can adsorb heavy metal ions, can be applied to repairing of lead-cadmium combined polluted soil, meanwhile, the material performance is stable, long-term effectiveness is achieved, plant straw and sludge are adopted as raw materials, and the cost is low. And the metho