The utility model discloses a vehicle-mounted terminal of a warehouse information management system. Including a base, a hinged support is arranged on the base; a shaft hole is formed in the hinged support; the hinged supports are rotationally connected with rotating shafts through shaft holes; connecting rods are arranged on the outer walls of one sides of the rotating shafts; a first clamping ring is arranged at the other end of the connecting rod, a second clamping ring is clamped to the upper end of the first clamping ring, a first clamping groove and a second clamping groove are formed inthe outer wall of the rotating shaft, a through hole is formed in the hinged support, a bolt is inserted into the through hole, the bolt is inserted into the second clamping groove, and a spring is arranged between the outer wall face of one end of the hinged support and the bolt. Inclined supporting of the right end face of the plug is achieved, the possibility that the plug moves rightwards isgreatly avoided, the stability of inserting the plug into a slot of a mainframe box is improved, the plug can be rotated and attracted to a magnetic block to be positioned, and the use convenience ofthe rotary supporting connecting rod structure is improved.