Slide rail locking device

The invention belongs to the technical field of communication car antenna slide rails and in particular relates to a slide rail locking device. The device comprises a guide rail and a permanent seat which are in slide fit with each other, wherein the permanent seat is provided with a locking piece hinged with the permanent seat; one end of the locking piece leans against the guide rail; and the guide rail is provided with a groove in stuck and embedded fit with the end of the locking piece. The permanent seat is provided with the locking piece with one end leaning against the guide rail and the locking piece can be in stuck and embedded fit with the groove on the guide rail, therefore, the locking device can effectively lock the position of the guide rail and limit the guide rail to slide; and the locking piece is hinged with the permanent seat, therefore, when the locking piece rotates around the hinge portion and is separated from the groove on the guide rail, the limit to the guide rail is released and the guider rail can re-slide until the guide rail is locked again. The locking device is simple in structure and practical and reliable.