Safety lifting device for vehicle maintenance

The utility model relates to the field of lifting devices, in particular to a safe lifting device for vehicle maintenance. Oil cylinders used for driving the support to move are symmetrically arranged at the front end and the rear end of the support. The two platforms are each provided with a limiting device, each limiting device comprises a supporting table, a gear, a swing arm and a chuck, the supporting tables are fixedly connected to one ends of the outer sides of the platforms, vertical supporting shafts are arranged on the supporting discs, the gears are connected to the supporting shafts in a pivoted mode, one sides of the peripheries of the gears are connected with the swing arms, and the chucks are connected with the swing arms. A positioning lock which can be meshed with the gear is arranged on the other side of the periphery of the gear; a chuck is arranged at the end, away from the gear, of the swing arm, a groove is formed in the middle of the chuck, an insertion rod is fixedly connected to the b