The invention belongs to a spray maintenance trolley for a tunnel secondary lining. The spray maintenance trolley is composed of a trolley body, wheels, a cab, a spray header, water pump equipment, inflation equipment and a water tank, wherein the trolley body is used for carrying and moving the water pump equipment, the inflation equipment, the water tank and an air sac telescopic water spray belt, wherein the air sac telescopic water spray belt is used for forming a telescopic water spray supporting frame and collecting spray water in a water collecting and filtering tray, the water collecting and filtering tray is used for collecting and filtering the spray water in the water tank for recycling, the water pump equipment is used for pumping spray water into a spray pipe, and the inflation equipment is used for pumping air into left and right Inflatable supporting tubes. The spray maintenance trolley is provided with the air sac telescopic water spray belt structure, and has the advantages of reasonable design, shrunk spraying system, simple structure, short occupation time of the internal space of a tunnel during the shrunk period, time, labor and water conservation and good using effect.