Flatness detection equipment

The utility model provides flatness detection equipment which comprises a U-shaped plate, a guide rod is installed between two transverse parts of the U-shaped plate, the outer end of the guide rod is in sliding connection with a sleeve, a vertically arranged movable rod is installed on the left side of the sleeve, the outer end of the movable rod is in sliding connection with a guide cylinder, and the guide cylinder is installed at the left end of the sleeve. A fixing part of the first rolling component is arranged at the lower end of the movable rod, a transversely-arranged straight cylinder is arranged on the upper side of the left end of the movable rod and located on the upper side of the guide cylinder, a movable plate is slidably connected into the straight cylinder, and a mounting cylinder used for assembling a paintbrush is mounted at the left end of the movable plate; the installation cylinder extends out of the left side of the straight cylinder, an opening of the installation cylinder faces the lo