Maintenance box capable of working stably

The utility model discloses a maintenance box stable in work, which comprises a maintenance box body, a placing bin is arranged on the maintenance box body, a box door is hinged on the maintenance box body, four vertical rods are fixedly arranged in the placing bin, a plurality of placing frames are connected on the four vertical rods in a sliding mode, two screw rods are connected in the placing bin in a rotating mode, and the two screw rods are connected with the box door in a sliding mode. The two screw rods are symmetrically arranged on the two sides of the containing frame, the two screw rods are in threaded connection with a door-shaped frame, a pair of first sliding rods are fixedly welded to the inner walls of the two sides of the door-shaped frame, and each pair of first sliding rods is slidably connected with a first moving rod. The maintenance box solves the problems that in the prior art, when a maintenance box is used, a containing frame needs to be manually pushed, when concrete test blocks are