The utility model relates to the technical field of puppet stage props, and discloses a puppet stage background replacing device which comprises a top plate, an adjusting mechanism is arranged at the bottom of the top plate, a replacing mechanism is arranged on one side of the adjusting mechanism, and a connecting shaft is arranged on the inner side of the replacing mechanism. The end, away from the replacing mechanism, of the connecting shaft is fixedly connected with a background cloth storage roller. According to the puppet play stage background replacing device, through the arranged adjusting mechanism, an inner spline drives a first supporting shaft to rotate through a corresponding outer spline, so that a background cloth storage roller can rotate, the purpose of background cloth lowering is achieved, in the same way, a second motor drives an output shaft to rotate reversely, and the purpose of background cloth winding can be achieved; when multiple backgrounds need to be flexibly switched, operation is facilitated, the flexible performance of the device is enhanced, meanwhile, the puppet stage performance work can be further carried out conveniently, and the time consumed by workers in the operation process is shortened.