The invention discloses a fully-closed gas extraction pump energy saving system based on anti-drag working fluid. The fully-closed gas extraction pump energy saving system comprises a gas purificationsystem, a gas extraction pump working fluid circulation system, a fluid infusion system and an upper computer monitoring system. Gas in an extraction pipeline carries part of coal dust into a gas extraction pump with the macromolecular anti-drag fluid as a working medium after being purified through a cyclone dust-falling device, and the anti-drag working fluid is recycled through a gas-fluid separator and a fluid-fluid heat exchanger, and fully-closed circulation of the anti-drag fluid is achieved by taking a low-resistance dewaterer on a gas exhaust pipeline as aiding. The fluid level inside the gas-fluid separator is monitored through a fluid level sensor, fluid infusion in the gas-fluid separator is automatically achieved through the monitoring system, the flow of the anti-drag fluid,the differential pressure of the heat exchanger, the dust concentration in the pipeline and the like are monitored in real time, and stable and reliable operation of a ground extraction system is ensured. According to the fully-closed gas extraction pump energy saving system, the operating efficiency and water saving capacity of a gas extraction pump station can be improved greatly, the cost of the anti-drag fluid is lowered remarkably, manpower and material resources are saved, and application is wide.