The invention discloses a separation and heating crushing machine. The separation and heating crushing machine comprises a machine body, wherein a feeding opening A is formed in the upper end of the machine body, a discharging opening is formed in the lower end of the machine body, a crushing chamber is arranged in the machine body, a blending device is arranged in the crushing chamber, and comprises a fixed screw rod and a crushing screw rod, the fixed screw rod is provided with a spiral cutter blade A, the crushing screw rod is provided with a spiral cutter blade B, the spiral cutter blade A and the spiral cutter blade B are arranged in a staggering manner, and a filter net is arranged in a lower end opening of the crushing chamber. A feeding opening B is also formed in the machine body, the lower end of the feeding opening A is connected with a guide pipe A, the feeding opening B is connected with a guide pipe B, the guide pipe A is connected with the guide pipe B, a protrusion end is arranged on one end, adjacent to the feeding opening A, of the guide pipe A, the bottom of the guide pipe A is provided with a piston block, and a projection is arranged on the position, adjacent to the protrusion end, in the guide pipe A. By adopting the separation and heating crushing machine, the plastics can be molten by utilizing hot air, and the molten plastics can enter the crushing chamber to be crushed only at a specified temperature, so that the abrasion of a crushing cutter can be alleviated.