The invention discloses a vibration sieve umbrella-shaped cap polishing fixture. The vibration sieve umbrella-shaped cap polishing fixture comprises a polishing mechanism and a supporting mechanism, wherein the polishing mechanism comprises a lifting support and a lever-type polishing device, the supporting mechanism comprises a lower rotating supporting mechanism and an upper clamping positioning mechanism. The rotating supporting mechanism mainly consists of a support, motors, a reducer and a connecting shaft. The clamping positioning mechanism mainly consists of a rotating platform, an up-down crossed type bidirectional lead screw, a supporting body and workpiece clamping blocks. The vibration sieve umbrella-shaped cap polishing fixture is simple in structure, and convenient in using, the different sizes of spin vibration sieve umbrella-shaped caps can be quickly clamped and fixed on the supporting mechanism, and the dip angle position of the polishing machine and the height position of the polishing machine can be freely adjusted according to requirements, the design of the lever structure is adopted, not only is the operation convenient, but the manpower and the material resources are saved, and the polishing efficient is improved to a certain extent.