The invention discloses a wall-climbing type shot blasting robot, and belongs to the field of robots. According to the shot blasting robot, the problem that the efficiency of paint removal and rust mode for an existing ship surface is low is solved. The shot blasting robot is characterized in that under the action of corresponding air cylinders, a first sliding seat and a second sliding seat do reciprocating sliding motion on a first linear guide rail and the second linear guide rail respectively; the two linear guide rails are arranged on the bottom surface of a machine frame in parallel; a first vacuum sucker and a second vacuum sucker can slide along with the first sliding seat, and a third vacuum sucker and a fourth vacuum sucker can slide along with the second sliding seat; when a wheel type walking unit goes straight, the moving direction of the machine frame is parallel to the sliding direction of the first sliding seat; when a wheel type walking unit is turned, the first sliding seat rotates relative to the first vacuum sucker and the second vacuum sucker, and the second sliding seat rotates relative to the third vacuum sucker and the fourth vacuum sucker; the four vacuum suckers correspond to four cylinders respectively, wherein each air cylinder is used for adjusting the distance between the corresponding vacuum sucker and a to-be-sucked surface and sliding friction force of the wheel type walking unit; and the machine frame is provided with a shot blasting chamber.