The invention discloses an electric heating belt of a crankshaft box of an air conditioner compressor. The electric heating belt comprises a heating belt body, a power line, two clamping buckles and a tension spring, wherein the heating belt body is internally provided with heating wires; after one end of the power line is in electrical connection with the heating wires in the heating belt body, and the other end of the power line is externally connected to a power supply; the two clamping buckles are correspondingly arranged at the two ends of the heating belt body; one end of the tension spring is connected with one of the clamping buckles, and when the heating belt body is wound around the crankshaft box of the compressor, the other end of the tension spring is connected with the other clamping buckle in a clamped mode. According to the electric heating belt, the fact that the crankshaft box of the air conditioner compressor is heated evenly can be achieved, and the phenomenon that proper work cannot be achieved due to the temperature environment is avoided.