Anti-falling two-column lifting machine

An anti-falling two-column lifting machine comprises two symmetrically-arranged lifting assemblies, wherein each lifting assembly comprises a lifting stand column, lifting arms and a lifting sliding table, a sliding groove is formed in the inner side of each lifting stand column, each lifting stand column is in sliding fit with the corresponding lifting sliding table through the corresponding sliding groove, every two lifting arms are arranged on each lifting sliding table in a through mode, a lifting structure is arranged at one end of each lifting arm, and the other end of each lifting arm is rotationally matched with the corresponding sliding table through a pin shaft; and the top of each lifting stand column is provided with a protective beam perpendicularly connected with the lifting stand column, the two protective beams are connected through two flexible connecting belts, the two ends of each flexible connecting belt are connected to the same sides of the different protective beams, each flexible conne