The invention provides a circular plate cut-off technology. The technology includes a circular plate cut-off device and a circular plate cut-off method. The circular plate cut-off device comprises a support, a cut-off plate, weights, a cutter die and an ironing plate. The circular plate cut-off method includes the cutting process of natural cattlehide and sheepskin materials. The three-dimensional cut-off method is designed according to the characteristics of natural leather and requirements of upper forming so that the upper natural leather materials can be cut off and formed in the primary pre-forming state; by means of an arc-shaped cushion plate layer and an arc plate, better part shape is provided for upper overall forming, and accordingly the effects of saving materials, improving material smoothness and reducing upper forming difficulty are achieved.