The utility model relates to a rotatable round pin axle fabrication hole combination baffle mechanism. The cash is leaked easily in current hydraulic support fabrication hole department. Therefore, this rotatable round pin axle fabrication hole combination baffle mechanism includes side guard plate and closing cap, spacer sleeve and backing pin board, it has the fabrication hole to open on the side guard plate, the backing pin board is shallow dome shape, its external conjugate diameter be greater than the adapted ship and resell on another market the axle the diameter, the closing cap also is shallow dome shape, be equipped with four evenly distributed's outstanding cardboard on the outer circumference, the spacer sleeve also is shallow dome shape, open at its center has the through -hole, this through -hole be greater than the adapted ship and resell on another market the axle the diameter, the spacer sleeve covers on the fabrication hole from inboard, glue or be fixed through spot welding through powerful between spacer sleeve and the side guard plate, the fabrication hole main part is circularly, it has four breachs to open on its outer circumference, four breach around fabrication hole evenly distributed, but fabrication hole and breach are crossed to closing cap and outstanding cardboard one -to -one ground, deflect the back card on the peripheral side guard plate of fabrication hole. The utility model discloses easy dismounting is fit for plugging fluid and presses support round pin axle fabrication hole.