The invention provides a water-saving heat insulation pipeline. The water-saving heat insulation pipeline comprises a water storage tank, a water inlet pipe, a water outlet pipe, a water return pipe and a filter device. The lower portion of the water storage tank is communicated with the water outlet pipe, the water outlet pipe is communicated with one end of the filter device, the other end of the filter device is connected with the water return pipe, the water return pipe is communicated with the water inlet pipe, the water storage tank is arranged under the water outlet end of the water inlet pipe, one side of the water return pipe is communicated with a tap water pipe, the tap water pipe divides the water return pipe into an upper water return pipe and a lower water return pipe, the portion, close to the tap water pipe, of the lower water return pipe is provided with a check valve, water only can flow from bottom to top under the action of the check valve, a water pump is arranged in the filter device, the water pump is communicated with the water return pipe and pumps water into the water return pipe from the filter device, and one side of the water storage tank is communicated with a water use pipe. The pipeline is high in stability and capable of achieving filtration and cyclic utilization of waste water; the water pressure of a system is effectively stabilized, and the water discharge amount is easy to control; a heat insulation layer arranged outside the water inlet pipe can prevent the interior of the water inlet pipe and a screw blade from being frozen.