The invention discloses a tug-of-war device, which comprises a box body, wherein a top pipe is connected to the topmost end of the box body; a balancing weight is connected to the bottom wall of the box body; a left water tank is arranged at the left side of the interior of the box body, and symmetrically, a right water tank is arranged at the right side of the interior of the box body; water in A color is injected into the left water tank and water in B color is injected into the right water tank; a left piston, which is vertically arranged, is arranged in an opening in the right end of the left water tank, and a right piston, which is vertically arranged, is arranged in an opening in the left end of the right water tank; and a pressure valve is arranged in the box body below the left and right water tanks. According to the tug-of-war device provided by the invention, water can be continuously sprayed upwards when two competition sides of tug-of-war are in a stalemate, and through color of a sprayed water column, the side, which is relatively stronger in strength, can be indicated. As strength of the two sides changes, the color of the sprayed water column is correspondingly converted between the A color and the B color, and when the strength of the two sides is equal, the sprayed water column is represented in the third mixed color; therefore, strength contrast of the two competition teams can be displayed intuitively; and interesting of a tug-of-war game can be also greatly enhanced.