Anti-falling mechanism and medical movable X-ray machine

The X-ray machine comprises a machine body and a lifting mechanism, the lifting mechanism comprises a stand column connected with the machine body, a sliding frame connected to the stand column in a sliding mode, a cone pulley connected with the sliding frame, a pulley installed on the stand column and a connecting rope, and the connecting rope is wound around the pulley and connected to the cone pulley and the stand column. The anti-falling mechanism comprises an installation frame connected to the sliding frame in a sliding mode, a first elastic piece installed on the sliding frame and abutting against the installation frame, a plug pin connected to the sliding frame in a sliding mode, a second elastic piece installed on the sliding frame and abutting against the plug pin, a locking piece connected to the installation frame and abutting against the plug pin, and a plurality of groove structures formed in the stand column. The cone pulley is mounted on the mounting frame; and when the connecting rope is brok