The utility model discloses a mine car with an automatic brake. A brake claw which can rotate upward and downward is mounted on the front shaft and the rear shaft of the mine car respectively; two electromagnetic locks and controllers are mounted on the underframe of the mine car, and a permanent magnet is mounted on the wheel; the control circuit comprises a power supply, a singlechip, two relays, a triode switch circuit, two magnetic switches and a mercury tilt switch, and is used to control the action of the electromagnetic lock. In the case of the runaway of the mine car, the mine car plays a braking role and the accidents can be avoided.