The invention relates to an anti-dropping signal lamp box to solve the problem that bolts are prone to exposure when a signal lamp in the prior art is mounted and fixed. When the anti-dropping signallamp box is mounted, a bottom plate of a box body is fixed to a wall through a wall connecting structure; then signal lamps are fixed to nuts welded under a signal lamp panel by using signal lamp fixing bolts, and the upper halves of the signal lamps penetrate through signal lamp mounting holes to emit indicating light; and finally, wires on the wall are led into the signal lamps through wire passing holes, and the signal lamp panel is fixed to the bottom plate of the box body through a connecting structure. In the process, the signal lamp fixing bolts are completely positioned in a bottom box, and the connecting structure is also covered in a lower end opening of the signal lamp panel. When viewed from the front, only one complete signal lamp panel and the signal lamps protruding from thesignal lamp mounting holes can be seen, and no connecting bolt or screw is exposed. The attractiveness of the anti-dropping signal lamp box is ensured and the anti-dropping signal lamp box is beneficial to increasing the market competitiveness of products.