The invention discloses a propeller force measuring device applied to a high-speed circulation water tank. The force measuring device structurally comprises a fixed connecting plate, a connecting hole, a fixed branch pipe, a casing, a force measuring interface, a force measuring chamber and a bearing ring, and the connecting hole is arranged in the left side of the surface of the fixed connectingplate and integrated with the connecting plate. The fixed branch pipe is fixedly connected with an outside device via connecting screw holes arranged in upper and lower ends of the left side of an adapter, an outside rotating force is received to implement rotation, a driving rod is driven, the middle portion of the driving rod is connected with a stabilizing plate and a stabilizing pulley, the stabilizing plate and the stabilizing pulley are cooperated so that the driving rod rotates in the inner wall of a support shrouding to enhance the stability of transmission, and a fixed plate arrangedin the right side of the support shrouding is fixedly connected with the outside device to support and protect the internal driving rod. Outside influence is prevented, and the measuring accuracy of the device is improved.