Grout leakage prevention type prefabricated box girder formwork structure

The utility model discloses a slurry leakage prevention type prefabricated box girder formwork structure which comprises an outer formwork mechanism, an inner formwork mechanism, a base mechanism anda leakage prevention mechanism, the base mechanism comprises a lower base, and a first channel steel plate and a first buffer block are arranged in a first side groove in the side wall of the lower base; two first transverse grooves are formed in the upper end of the lower base, and a group of leakage-proof mechanisms are arranged in each first transverse groove; the leakage-proof mechanism comprises a leakage-proof top plate, a second channel steel plate and a third channel steel plate, wherein the second channel steel plate and the third channel steel plate are connected to the lower end ofthe leakage-proof top plate. The leakage-proof top plate is clamped to the upper end of the first transverse groove. The second channel steel plate is connected with the first positioning frame through a first positioning bloc