Rubber forming tool

The utility model discloses a rubber forming tool which comprises a pressing die, a middle die, a lower die and a bottom table, the lower die is arranged on the bottom table, a mounting cavity is formed in the lower die, the lower end of the middle die is arranged in the mounting cavity, a moving cavity is formed in the middle die, and the pressing die is arranged on the inner side of the moving cavity and moves up and down along the moving cavity. A connecting channel communicated with the mounting cavity is formed in the inner bottom surface of the lower die, a plurality of runners communicated with the connecting channel are formed in the outer side of the lower die, and a plug is arranged on each runner. According to the utility model, a semi-finished product sizing material is pressed downwards through the pressing die, the semi-finished product sizing material is pressed out from the runner, and the runner can be set to be round, square and other shapes according to the requirements of the size and the