Mud curing agent

The invention discloses a mud curing agent. The mud curing agent comprises the following raw materials in part by weight: 30 to 50 parts of rapid-hardening sulfoaluminate cement, 40 to 50 parts of river sand, 5 to 15 parts of ground plaster, 5 to 15 parts of calcium chloride and 0.025 to 0.075 part of cellulose carboxyl material. A using method for the mud curing agent comprises that: the colloid system of the mud must be subjected to colloid breaking treatment by adopting a colloid breaker before the mud is cured, and the mud curing agent is added into the mud after colloid breakage according to a certain proportion, so the mud can be well cured. By effective curing treatment for the mud, the original lacking land resource of China is saved, and the curing of the mud is realized, so that other constructions can be performed after soil is covered for returning tillage or certain curing strength is met, and the mud curing agent has good economic and social benefits.