Hydraulic mechanism system flushing device and flushing method

The invention belongs to the field of hydraulic mechanism system flushing equipment and methods, and particularly relates to a hydraulic mechanism system flushing device and method. The hydraulic mechanism system flushing device comprises an oil tank, a filter, an oil inlet pump and an oil drain pump; the filter is used for pressurizing and pumping oil in the oil tank into the flushed hydraulic mechanism system, an outlet of the filter is communicated with the oil tank, the oil drain pump is connected to the upstream of the filter, and an oil suction port of the oil drain pump is used for being communicated with the flushed hydraulic mechanism system. According to the method, oil pumping and oil suction are matched, so that pumping of the oil drain pump on hydraulic oil in the flushed hydraulic mechanism system is not affected by the filter any more, and even if the flushed hydraulic mechanism system is complex in structure, flushing and purification of the hydraulic oil in the hydraulic mechanism system can