Universal trackball

The utility model provides a universal trackball which comprises a plastic upper cover, a plastic middle cover, a plastic bottom cover, an electronic circuit board, a first stainless steel shaft, a second stainless steel shaft, a third stainless steel shaft, a fixed bearing, a carrying bearing, a plastic gear and a driving ball. The bearing driving ball is fixed in a first positioning groove and a second positioning groove in the plastic middle cover, the bearing bearing penetrates through the fixed bearing to be installed in a third positioning groove in the plastic middle cover, the bearing driving ball is higher than the plastic middle cover, and the first stainless steel shaft and the second stainless steel shaft collect rolling information of the driving ball and drive the plastic gear to rotate. An infrared receiving tube on the electronic circuit board collects rotation information of the plastic gear and transmits the rotation information to a terminal, so that electronic games and machines are accura