Energy-saving hydraulic system for loaders

The invention discloses an energy-saving hydraulic system for loaders, which comprises a hydraulic pump, a low-pressure closed oil tank, a high-pressure energy accumulator, a medium-pressure energy accumulator and a hydraulic control unit, wherein the hydraulic control unit is integrally provided with a first check valve, a second check valve, a third check valve, a first safety valve, a second safety valve, a third safety valve, a first speed regulating valve, a second speed regulating valve, a first pressure sensor, a second pressure sensor, a first electromagnetic directional valve, a second electromagnetic directional valve, a first electromagnetic proportional directional valve and a second electromagnetic proportional directional valve. According to the invention, the high-pressure energy accumulator and the medium-pressure energy accumulator are used for storing the kinetic energy of a loader in the process of braking and the excess energy of the loader under low-load working conditions, and the low-pressure closed oil tank is used for storing the potential energy in the descending process of a movable arm, thereby achieving the purposes of reducing the fuel consumption of the loader and improving the operating efficiency of the loader.