The invention provides a purified water resource sharing device for filling lines. The purified water resource sharing device comprises a purified water producing tank, a water supply pipeline, supply pumps, an electromagnetic valve, a high-liquid-level sensor, a low-liquid-level sensor, a purified water storage tank and a plurality of water consuming pipelines. The lower end of the purified water producing tank is connected with the top of the purified water storage tank by the water supply pipeline, the first supply pump is mounted on the water supply pipeline and is close to the purified water producing tank, the electromagnetic valve is mounted on the water supply pipeline and is close to the purified water storage tank, the high-liquid-level sensor and the low-liquid-level sensor are arranged on the purified water storage tank, the supply pumps and the electromagnetic valve can be turned on and off under the control of the high-liquid-level sensor and the low-liquid-level sensor, the multiple water consuming pipelines are connected to the lower end of the purified water storage tank, and the corresponding second supply pump is mounted on each water consuming pipeline. The purified water resource sharing device for the filling lines has the advantages that sufficient water can be assuredly supplied to the various filling lines, cleaning procedures can be smoothly carried out, accordingly, manual intervention can be reduced, the next-day production continuity and efficiency can be guaranteed, and the safety of the supply pumps can be protected.