The invention discloses a troweling machine with a cooling spray nozzle. The troweling machine comprises a tank. A motor is arranged in the tank, a protective cover is arranged on the lower end surface of the tank, troweling cutters are arranged in the protective cover, a shaft of the motor sequentially penetrates the tank and the protective cover to be connected with the troweling cutters, the protective cover is connected onto the tank by two lifting rods, the lifting rods are stacked around the shaft of the motor, are rotatably connected with the protective cover, are connected with mounting lugs in a threaded manner and penetrate the mounting lugs, the mounting lugs are arranged on the side walls of the tank, the protective cover is in the shape of an inverted bowl, at least three roll balls are uniformly arranged at the edges of the lower end of the protective cover, and the spray nozzle is arranged in the protective cover and is positioned above the troweling cutters. The troweling machine has the advantages that the circular spray nozzle is arranged in the protective cover, so that the troweling cutters can be cooled by the aid of the circular spray nozzle, the troweling machine can assuredly continuously work, and the work efficiency can be improved.