The invention discloses an energy-saving irrigation system with a controllable rainprotection shed. The system comprises a host process, a solar extension set controller, the rainprotection shed, a domestic wastewater filtering system, a tap water system, a water tower and a pipeline. The domestic wastewater filtering system and the tap water system are connected with the water tower. The domestic wastewater filtering system comprises a floatation tank, a primary filter, a regulation tank, a materialization processor, a secondary filter and a disinfection device. The water tower is connected with the pipeline through an electromagnetic main valve. The pipeline is composed of a water conveying main pipe, a water conveying branch pipe and an irrigation micro-filtration pipeline. Each drip irrigation micro-filtration pipeline is provided with an electromagnetic valve, a flow meter and a solar soil humidity detector. According to the energy-saving irrigation system, the water resource utilization rate is effectively increased, energy is saved, emission is reduced, intelligent irrigation is achieved, water is supplied to soil and crop root systems on the basis of the microscale and normal pressure water outlet principle, evaporation leakage losses are avoided, and the effects of efficiently saving water and consuming water are achieved.