Automobile steering column locking device

The utility model provides an automobile steering column locking device. The automobile steering column locking device comprises a steering column, an external spline, an internal spline, a square slide block, a pull rod, a coupler, a motor, an ECU (electronic control unit) and the like, wherein the square slide block can slide up and down in a guide rail, the steering column is locked after the external spline on the steering column is combined with the internal spline on the square slide block when the square slide block slides up, and when the square slide block slides down, the external spline on the steering column is separated from the internal spline on the square slide block, and then the steering column is unlocked. The ECU controls work of the motor so as to enable the motor to supply power for up and down movement of the square slide block. The automobile steering column locking device has the advantages that the steering column is automatically locked after an automobile start key is pulled out, the steering column is automatically unlocked after the automobile start key is inserted, and then no additional operation step is needed, thievery prevention effects are simply and quickly achieved, and when a person does not hold the automobile start key and starts an automobile under abnormal operation, the steering column can not be unlocked, and therefore the achieved thievery prevention effects are good.