The invention discloses a waste circuit board disassembling machine. The waste circuit board disassembling machine mainly comprises two large rubber roll shafts, two screw rolling cutters, a gearbox, a sieve, a belt pulley, a belt, a heater, an electromotor and a series of transmission gears and transmission shafts, wherein a feeding hole of the circuit board disassembling machine is formed between the two rubber roll shafts; a waste circuit board 1 vertically placed is supported by the belt 13 below the feeding hole; an electronic component discharge hole is formed above the sieve 8; a component collecting box 9 is arranged below the sieve 8; a waste circuit board substrate outlet is formed between two protective covers behind the circuit board disassembling machine; a substrate collecting box 5 is arranged at the lower right of the waste circuit board substrate outlet. The waste circuit board disassembling machine disclosed by the invention has the characteristics of high disassembling efficiency, low component damage rate, low disassembling cost, low pollutant discharging quantity and the like.