Multi-layer circuit board capable of preventing circuit board from moving and colliding

The utility model discloses a multilayer circuit board capable of preventing the circuit board from moving and colliding, which comprises a plurality of positioning plates, a plurality of upright posts are arranged between every two adjacent positioning plates, a first gear is rotationally arranged in each positioning plate, a plurality of second gears are meshed around the first gear, and the second gears are meshed with the upright posts. A third gear is installed at the bottom end of each second gear, a plurality of sliding rods are installed in the positioning plate in a sliding mode, a V-groove clamping block is installed on each sliding rod, a gear groove is formed in each sliding rod, and through meshing of the first gears and the second gears, meshing of inner teeth of the sliding rods and the third gears and connection of the second gears and the third gears, the V-groove clamping blocks are installed on the sliding rods; therefore, each corner of the circuit board can be wrapped by the V-groove clam