The invention discloses a steel pipe cutting robot. The steel pipe cutting robot comprises a shell; an outer gear and a square through groove A are arranged on the shell; a sliding plate is arranged in the square through groove A; a square through groove B is arranged on the sliding plate; a rack is arranged in the square through groove B; a motor A and a connection block are arranged on the sliding plate; a gear A is arranged on the motor A; a boss is arranged on the shell; a baffle plate A, a baffle plate B and a motor B are arranged on the boss; a lead screw is arranged on the baffle plateA; a nut is arranged on the lead screw; a blade is arranged on the lower part of the rack; an ejection plate is arranged in the shell; pressure sensors are arranged on the ejection plate; a rubber padis arranged on the ejection plate; a vertical rod A is arranged in the shell; a guide wheel is arranged on the vertical rod A; an opening is arranged on the lower part of the shell; a support is arranged on an annular groove; a cushion block, a PLC, a support rod A, a motor D and multiple vertical rods B are arranged on a base; a gear B is arranged on a gear C; a sleeve is arranged on the supportrod A; a support rod B and a spring are arranged in the sleeve; the motor D is connected with a rotary shaft belt; and glass is arranged on the shell. The steel pipe cutting robot is simple and convenient for operation, capable of feeding materials automatically, and applicable to steel pipes of different thicknesses; and safety hazards are reduced.