The utility model discloses a microcomputer relay protection tester carries uses guard box, including box, chamber door, first hasp, second hasp, gasbag, trachea, miniature air pump, connecting pipe,check valve, outlet duct, sealing cap, fan, electric putter, connecting rod, ball cover, spin, a control switch, the 2nd control switch, the 3rd control switch and handle. The chain for stripping thebark has a reasonable structure, can be to the microcomputer relay protection tester protection of putting into the box through the gasbag, when carrying, the box bumps, can be effectual carry out theshock attenuation for the microcomputer relay protection tester, reduce the impact force that the microcomputer relay protection tester received, and filling through miniature air pump and outlet duct realization gasbag, the gassing, can be convenient for gasbag and microcomputer relay protection tester laminates, self rocking when reduction microcomputer relay protection tester carries, avoid microcomputer relay protection tester inner member to cause the damage.