Spherical fruit grading machine with adjustable grading sizes

The invention provides a spherical fruit grading machine with adjustable grading sizes. The spherical fruit grading machine comprises a framework, a feed end, a pre-cleaning device and cleaning devices. A fruit separating frame is fixedly mounted at the bottom of the framework, fruit separating grooves are formed in the fruit separating frame, a main rolling bar is arranged at the right end of the framework and is sequentially connected with first rolling bars of three rolling bar groups by chains, the three rolling bar groups are arranged on the framework and include a first rolling bar group, a second rolling bar group and a third rolling bar group, each rolling bar group comprises the three corresponding first rolling bars, and second rolling bars are arranged between the first rolling bar group and the second rolling bar group and between the second rolling bar group and the third rolling bar group. The spherical fruit grading machine has the advantages that the relative heights of the rolling bars can be