Multilayer circuit board

The utility model relates to the technical field of multi-layer circuit boards, in particular to a multi-layer circuit board, which comprises a main substrate, a T-shaped first fixing plate and a T-shaped second fixing plate are symmetrically arranged on two sides and two ends of the main substrate, and a U-shaped locking toggle is inserted in the middle of the upper surface of each of the first fixing plate and the second fixing plate in a penetrating manner. A first base plate is arranged on the upper surface of the main base plate, a second base plate is arranged on the lower surface of the main base plate, limiting rods and two-way screws are inserted into the four corners of the first base plate and the four corners of the second base plate in an oblique symmetry state correspondingly, threads are arranged on the outer surfaces of the limiting rods, and the two ends of each limiting rod are sleeved with threaded sleeves. Limiting sleeves are arranged at the contact positions of the first base plate and t