Energy-saving hoisting system of hydraulic crane

The utility model relates to an energy-saving hoisting system of a hydraulic crane. The energy-saving hoisting system comprises a hydraulic oil tank, a hydraulic pump, a hoisting motor and a control valve, wherein the hydraulic pump is driven by a prime motor, an inlet of the hydraulic pump is connected with the hydraulic oil tank, and an outlet of the hydraulic pump is connected with the hoisting motor through the control valve; the hydraulic oil tank is connected with a hydraulic energy storage pump and the hydraulic pump respectively; the hydraulic energy storage pump is connected with an unloading overflow valve, the unloading overflow valve is connected with an energy accumulator and a hydraulic control one-way valve, and the hydraulic control one-way valve is connected with a three-position four-way valve; and the hydraulic pump is connected with the overflow valve and the three-position four-way valve respectively, the three-position four-way valve is connected with the hoisting motor through a shuttle valve and a two-way balance valve, and the hoisting motor is provided with a normally closed type brake. The energy-saving hoisting system of the hydraulic crane is reasonable in structure, reliable in performance and capable of recycling gravitational potential energy, reducing hoisting power loss and reducing abrasion between the hydraulic energy storage pump and a rope wheel.