The utility model discloses an inspection robot, which comprises two inspection robot bodies. Each inspection robot body comprises a travelling wheel set mechanism, a clamping mechanism and a pitch change mechanism. Each pitch change mechanism comprises a substrate, a slide carriage, a lead screw, a nut and a pitch change driving device, wherein the slide carriage is arranged on the substrate; the lead screw is erected on the substrate; the nut is in screw-thread fit with the lead screw, and connected with the slide carriage; the pitch change driving device is arranged on the substrate. Each clamping mechanism comprises a support box, a support frame, a first live shaft, a second live shaft, a clamping driving device, a first clamping jaw and a second clamping jaw, wherein the support box is arranged on the substrate; the support frame is arranged on the support box; the first live shaft and the second live shaft are arranged on the support frame and connected through a transmission mechanism; the clamping driving device is used for driving one of the first live shaft and the second live shaft to rotate; the first clamping claw is fixedly arranged on the first live shaft; the second clamping jaw is fixedly arranged on the second live shaft; the first clamping claw and the second clamping jaw can be hooked onto a line after being crossed, and can break away from the line after being separated. According to the inspection robot disclosed by the utility model, an effect of stepping over barriers can be achieved through the action of each pitch change mechanism.