The invention discloses a water gun toy and a using method thereof. The water gun toy comprises a machine body, a first cavity arranged in the machine body and a second cavity arranged in the machinebody, a first rotating shaft which extends front and back and a second rotating shaft which is position on the right side of the first rotating shaft are rotationally arranged in the second cavity, the tail ends of the front side and the rear side of the first rotating shaft penetrate through the front end wall and the rear end wall of the second cavity and extend out of the machine body to be fixedly provided with first rolling wheels, and first belt wheels which are symmetrical front and back are fixedly installed on the outer surface of the second rotating shaft in the second cavity. According to the water gun toy and the using method thereof, the water gun toy is simple in structure and convenient to operate, through pedaling by an operator, the water gun toy is driven to move, meanwhile, a liquid needing to be sprayed is pressurized, so that the purpose of spraying through the water gun is achieved, meanwhile, a large amount of clean water can be carried by the water gun toy in amore labor-saving mode, the countervailing power of the water gun toy is improved, the water gun toy is convenient to move, moreover, all the working procedures cooperate with one another and do not influence one another, and the practical performance of the water gun toy is improved.