The invention discloses a sheet forming machine. The sheet forming machine structurally comprises a slicing cutting tool clamping groove, slicing cutting tools, a moving cover, a transmission hinge pin, a controller moving bracket, a controller, a reinforcing frame, a slicing device, a discharging guide pipe, a base and omnidirectional wheels. According to the slicing device, a potato can be fixedautomatically by a positioning mechanism to prevent moving during the slicing process. Through a slicing transmission mechanism, the transmission hinge pin can be rotated by transmission, and therefore the moving cover and the top face of an outer cover can be closed. Through the slicing cutting tools, the fixed potato can be sliced, and therefore thickness of sheets is consistent. Through an unloading mechanism, a placing moving plate can be oblique, the sliced potato is guided into a material guiding mechanism, and can be output through a discharging pipe.