Drawer guide rail with automatic locking device

The utility model relates to a drawer guide rail with an automatic locking device, comprising a fixed guide rail and a slider, which is characterized in that an automatic locking device composed of a sliding chute, a slider, a spring rod and a spring is provided at the back end of the fixed guide rail; a sliding chute base positioned inside the back end of the fixed guide rail is a cuboid with an open bottom surface and a top surface as high as the fixed guide rail; an L-shaped horizontal sliding chute with a vertically downward section at the front end is opened at the top surface; the slider is closely adjoined to the bottom surface of the horizontal sliding chute; a cylindrical guiding raised head matched with the horizontal sliding chute is provided at the top surface; the spring rod is positioned in an oblong hole in the rear end face of the sliding chute base and a through hole in the end face of the slider; a spring is positioned on the spring rod between the through hole of the slider and a stop block at the tail end of the spring rod; an arc guide groove matched with the guiding raised head is provided on the back end of a sliding guide rail. The utility model has the advantages of automatic locking drawer, less liability of sliding out, simple structure, convenient assembly and usage, and suitability for drawers in office tables.