The invention provides a refrigerant for use in detection of working stability of a digestive tract power detector. The refrigerant is sprayed to a confined space to be precooled in an atomized manner by taking high-pressure nitrogen as a carrier, and comprises 16 parts of methanol, 5 parts of glycerol, 3 parts of liquid ammonia and 2.3 parts of fumed silica all in parts by mass. A condensate is atomized and then uniformly sprayed to the confined space of a precooling section, under negative pressure and temperature conditions of the condensate, the methanol and liquid ammonia are vaporized, and heat is taken away to achieve rapid condensation, a part of the methanol and liquid ammonia are adsorbed in pores of the fumed silica, and the pores of the fumed silica are closed by the glycerol, so as to achieve the effects of delaying release, lowering the refrigerating efficiency and the refrigerating rate and prolonging the aging effect of refrigeration, the methanol and the liquid ammonia are discharged by a negative pressure tube after vaporized, most of the fumed silica and glycerol are discharged together, and a small part of the fumed silica and glycerol are attached to the surface of the digestive tract power detector to play a protective effect.