Four-column high-precision polishing machine

The invention relates to polishing equipment, in particular to a four-column high-precision polishing machine which comprises a base and a machine frame arranged on the base, a lower large disc is installed on the base, four upper disc assemblies are arranged on the lower large disc and evenly distributed on the lower large disc through positioning assemblies, and the four upper disc assemblies are arranged on the lower large disc. A servo motor arranged in the base drives the lower large disc to rotate through a speed reducer, each upper disc assembly is driven by an air cylinder to move up and down, and when the upper disc assemblies descend to the lower large disc, the upper disc assemblies carrying to-be-polished pieces rotate on the rotating lower large disc so as to grind and polish the to-be-polished pieces. The four upper disc assemblies are adopted for grinding and polishing on the rotating lower large disc, four pieces to be polished can be machined at the same time, and the machining efficiency is