The invention discloses a universal paperboard grasping mechanism in order to overcome the defects that an existing paperboard grasping mechanism is low in automation degree, low in work efficiency and large in labor intensity, and paperboards are prone to being scattered during conveying. The universal paperboard grasping mechanism comprises a support, a conveying assembly, a grasping assembly and an organizing assembly, wherein the conveying assembly, the grasping assembly and the organizing assembly are installed on the support; a guide supporting frame is installed at the front end of the support and comprises a supporting rod and a bottom plate connected to the upper end of the supporting rod; the front end of the bottom plate is connected with a guide arc plate; the bottom plate is provided with an avoiding groove, and the two sides of the avoiding groove in the bottom plate are connected with tidy lateral plates with an adjustable interval; the grasping mechanism comprises a U-shaped grasping clamp, a push piston cylinder and a lifting linear module, the front end of a telescopic rod of the push piston cylinder is fixedly connected with the U-shaped grasping clamp, the linear module is provided with a module sliding block, and the push piston cylinder is adjustably installed on a connecting baffle which is fixedly connected with the module sliding block; a paper blocking assembly is installed in the position, near the organizing assembly, of the support.