Auxiliary sinking device for open caisson

The utility model discloses an auxiliary sinking device for an open caisson, which comprises a moving device, a hoisting device arranged on the moving device, a first air cylinder arranged on the hoisting device, a connecting plate arranged at the output end of the first air cylinder, and a supporting shaft arranged at the center of the bottom end of the connecting plate. A plurality of first connecting rod assemblies distributed circumferentially are rotationally installed on the outer wall of the supporting shaft, a same supporting block is rotationally installed on each first connecting rod assembly, a plurality of second air cylinders are arranged at the top end of the connecting plate, a same sliding block is installed on output shafts of the second air cylinders, and the sliding block is installed on the outer wall of the supporting shaft in a sliding mode. According to the open caisson supporting device, the second air cylinder stretches out and draws back to drive the sliding block to ascend and desce