Sliding mechanism capable of automatically closing and popping up

The invention discloses a sliding mechanism capable of automatically closing and popping up, and belongs to the field of support devices. The sliding mechanism comprises a fixed frame, guide mechanisms, movable frames and pressure spring mechanisms, wherein the fixed frame comprises a base and a supporting frame, the guide mechanisms are arranged on the supporting frame, each guide mechanism comprises a guide rail and a guide shaft, and elastic devices are arranged in the guide rails. The movable frames are installed on the supporting frame and each provided with a first long-strip-shaped holeand a guide wheel group, the first long-strip-shaped holes sleeve the guide shafts, the guide wheel groups are matched with the guide rails, the movable frames slide on the supporting frame through mutual cooperation of the first long-strip-shaped holes and the guide shafts, and the elastic devices are fixedly connected with the movable frames. One end of each spring mechanism is in running fit with the base, the other e