The invention discloses a separation device of melt-spun cast strips. The separation device comprises a rectangular separation board and paired push-rotation mechanisms arranged on the two sides of the separation board respectively. Each push-rotation mechanism comprises a rotary shaft, a bearing, a bearing support, a torsion bar, an air cylinder and an air cylinder base. The middle portion of each rotary shaft can rotationally penetrate into the corresponding bearing support through the corresponding bearing. The inner end of each rotary shaft is fixed to the side face of the separation board. The outer end of each rotary shaft is in rigid connection with one end of the corresponding torque rod. The bottom of each air cylinder is hinged to the corresponding air cylinder base. The top of each air cylinder is hinged to the other end of the corresponding torque rod. By the adoption of the separation device, products can be screened in classification according to the design requirements and performance, and a reliable guarantee is provided for the quality of the produced high-performance products.