Roof protection device of vehicle-mounted drilling and workover rig

The utility model relates to a cab top protection device, in particular to a vehicle-mounted drilling and workover rig chassis truck cab top protection device. The roof protection device of the vehicle-mounted drilling and workover rig is composed of a protection frame, a connecting plate, a supporting column, a pull rod, an assembling bottom plate and an adjusting screw rod. The connecting plateis welded to the side edge of one side of one end of the protection frame. A supporting column is welded to the other side edge of one end of the protection frame. A fixing plate is welded to the bottom end of the supporting column. Pull rods are hinged to one sides of the upper ends of the supporting columns; sliding blocks are hinged to the lower ends of the pull rods. The sliding block is in sliding connection with a T-shaped sliding rail on the assembling bottom plate. The roof protection device solves the problem that an existing steel wire rope abrades a cab. In addition, the structuraldesign that the pull rod i