The invention discloses a connection structure for a rotor spindle and a crank shaft of a double-end motor. The connection structure comprises the rotor spindle and the crank shaft, wherein the crank shaft comprises a cylinder connection base and a cylinder transmission part, the transmission part is located on one side of the bottom surface of the connection base to form an eccentric structure, the transmission part is provided with a rotor spindle installation hole which penetrates through the connection base, the crank shaft is provided with a clamp slot which is communicated with the rotor spindle installation hole, an installation slot is arranged on the rotor spindle corresponding to the clamp slot, a locating block is arranged in the installation slot and is adaptive to the clamp slot, and the crank shaft is provided with a drive mechanism for driving the locating block to swing. The connection structure is characterized in that the locating block and the drive mechanism for driving the locating block to swing are arranged between the rotor spindle and the crankshaft, so that when the locating block swings, the crank shaft is locked, as a result, the location of the crank shaft is guaranteed, the locking force between the crank shaft and the rotor spindle is increased, the crank shaft is prevented from being loosened in the rotation process, and the improvement of the center balance of the rotor spindle is guaranteed when both ends of the rotor spindle are provided with crankshafts.