The invention discloses an aluminum alloy paddle, comprising a paddle rod, a handle and a paddle plate; one end of the paddle rod is provided with an outside thread of the paddle rod, and the other end of the paddle rod is provided with an inside thread of the paddle rod; one end of the handle is provided with an outside thread of the handle, the handle is in threaded connection with the inside thread of the paddle rod through the outside thread of the handle; the front face of the paddle plate is provided with a diagonal guide flow groove and a long guide flow groove; the top part of the paddle plate is provided with an installing convex rod, and an installing hole is arranged in the installing convex rod; an inside thread of the installing hole is arranged on the inner wall of the installing hole; one end of the paddle rod containing the outside thread of the paddle rod is in threaded connection with the inside thread of the installing hole. The paddle can be made by a combining method; thus the paddle can be conveniently folded in idle state; meanwhile, the paddle body is a hollow structure, and foam is plugged in the hollow structure so as to prevent water entering the paddle body; meanwhile, the floating force of the paddle can be largely increased, thus the paddle can be floated at the water surface, and paddle can be prevented from falling in the water and sinking to the bottom part.