The invention relates to an electric starting device for a cylinder brake of a crane lifting mechanism. The electric starting device comprises a cylinder. The cylinder is provided with a fixing board, and a connecting board is arranged on the right side face of the fixing board. The connecting board is connected with a U-type support connected with a spring support in an embedded mode. The spring support is connected with an adjusting rod, and a nut is connected to the outer wall of the adjusting rod in a sleeving mode. A blocking piece and a spring are arranged in the spring support. A brake shoe is arranged at the other end of the spring. The left side face of the middle of the fixing board is connected with a cam shaft support, a cam shaft is connected to the interior of the cam shaft support in an embedded mode, spline teeth are arranged at one end of the cam shaft, and the left portion of the cam shaft is connected with a brake arm. A gear ring is arranged on the left portion of the brake arm, a connecting hole is formed in the right portion of the brake arm, the brake arm is connected with pushing arms, and the pushing arms are connected with a pusher. A cam is connected to the outer wall of the right portion of the cam shaft in a sleeving mode, and a wear-resisting sleeve is connected to the outer wall of the right end of the cam shaft in a sleeving mode. The wear-resisting sleeve is connected with the U-type support through a screw. The electric starting device has the advantages of being simple in structure, low in operating cost, wide in application range and safe in braking.