High-precision paperboard cutting device with automatic positioning function

The utility model discloses a high-precision paperboard cutting device with an automatic positioning function. And a conveying belt is installed in the machine frame. By installing the first positioning assembly and the like, when the device is used, an electric telescopic rod on the first positioning assembly is started to drive a corresponding limiting plate to move in the Y-axis direction of the conveying belt, so that the front face of a paperboard is pushed, and the longitudinal position of the paperboard is conveniently and automatically calibrated; then, electric telescopic rods on two symmetrically-distributed second positioning assemblies are started at the same time, corresponding limiting plates are driven to move in the X-axis direction of the conveying belt, pushing and limiting of the two end faces of the paperboard are achieved, the transverse position of the paperboard is conveniently and automatically calibrated, and fixing and limiting of the paperboard are achieved; and therefore, the paper