The utility model discloses a vertical adjustable formwork structure on the bottom portion of a bridge crash barrier. The structure can achieve the fact that the vertical displacement of a bottom pocket die can be adjusted up and down. The structure comprises an outer side formwork and the bottom pocket die, the outer side formwork is provided with a bottom formwork, the bottom pocket die is provided with a side face, and a vertical adjustable connecting device is arranged between the bottom formwork of the outer side formwork and the side face of the bottom pocket die. According to the vertical adjustable formwork structure on the bottom portion of the bridge crash barrier, the height changes caused by the influences of bridge body construction errors and prestressed tendon stretch-draw arch camber values can be met by adjusting the vertical displacement of the bottom pocket die, and therefore the bottom pocket die can be in close contact with a bridge body flange bottom plate, the situation that the clearance between the bottom pocket die and the bridge flange bottom plate is filled with batten mortar can be avoided, root rot caused by mortar leakage is avoided, unnecessary processes are reduced, working hours are reduced, working efficiency is improved, and production cost is reduced.