Equipment capable of realizing automatic diameter adjustment and sealing performance detection of drum brake

The utility model discloses a device capable of realizing automatic diameter adjustment and sealing performance detection of a drum brake, which comprises a detection table, a mounting seat, a position sensor, a pressurization and pressure relief mechanism, a standard brake drum and a controller, and is characterized in that the controller is electrically connected with the position sensor and the pressurization and pressure relief mechanism respectively; the drum brake can be arranged on the detection table through the installation seat, the standard brake drum is used for simulating a brake drum and can be coaxially arranged outside the drum brake in a sleeving mode, and the position sensor is arranged on the detection table and used for detecting the peripheral diameter of the drum brake. The pressurization and pressure relief mechanism can conduct pressurization and pressure relief on a hydraulic wheel brake cylinder in the drum brake so as to adjust the peripheral diameter of the drum brake and detect th