Oil injection device for maintenance of shock absorber

The utility model discloses an oil injection device for maintenance of a shock absorber, which is controlled by an external controller and comprises an oil cylinder used for storing oil. One end of the oil pumping pipe is inserted into the oil cylinder, and the other end of the oil pumping pipe is connected with a quantitative tank; a metering pump is mounted on the oil pumping pipe; quantitative oil is extracted from the oil cylinder through the quantitative pump and conveyed into the quantitative tank through the oil extraction pipe. One end of the quantitative tank is connected with the oil pumping pipe; the other end of the quantifying tank is connected with one end of the oil feeding pipe; an oil pump is mounted on the oil feeding pipe; oil is pumped from the quantitative tank through the oil pump and output through the oil conveying pipe so as to achieve workpiece maintenance oil injection. The filtering devices are distributed and mounted in the oil pumping pipe and the quantitative tank so as to filte