Electrically controlled air brake of crane

The utility model discloses an electrically controlled air brake of a crane, which is characterized by comprising an electronic control unit, a brake signal sensor, a wheel speed sensor, a brake master cylinder, an electrical control proportion relay valve, an ABS control valve, a back pressure control valve and a bridge control adjusting module. An air source is connected with the brake signal sensor, the brake master cylinder, the electrical control proportion relay valve, the ABS control valve, the back pressure control valve, the bridge control adjusting module, a steering bridge group brake and a driving bridge group brake through pipelines; and the brake signal sensor, the wheel speed sensor, the brake master cylinder, the electrical control proportion relay valve, the ABS control valve, the back pressure control valve and the bridge control adjusting module are all electrically connected with an electronic control unit. The utility model has the functions of service braking, anti-lock braking and driven sliding prevention control.