Clamping mechanism and paperboard cutting machine

The utility model relates to the technical field of paperboard processing, in particular to a clamping mechanism and a paperboard guillotine, which comprises a support frame body, the support frame body is connected with a support plate and a support frame, the support frame is connected with a threaded rod and a motor I, a movable plate is arranged above the support frame, the movable plate is connected with an abutting frame and a movable limiting rod, and the abutting frame is connected with a clamping plate. The movable limiting rod is connected with a positioning rod, a positioning spring and an electric telescopic rod; a positioning plate and an electric adjusting rod are arranged at one end of the electric telescopic rod; the paperboard clamping device has the beneficial effects that a movable limiting rod slides in a limiting groove hole through a positioning rod and a positioning spring, the position of a positioning plate is adjusted through an electric telescopic rod according to the size of a pape