Configuration of hydraulic element of excavator

The invention discloses configuration of a hydraulic element of an excavator. The configuration comprises a main pump, a rotary motor and a main control valve. The main pump is connected with an engine through a spline of a main shaft. The main pump is connected with the main control valve through a hydraulic pipeline. A work oil opening of the main control valve is connected with large cavities and small cavities of all oil cylinder openings of the excavator and oil inlet and return openings of the rotary motor and a walking motor, and the rotary motor is a double rotary motor. The double rotary motor is adopted, displacement and starting torque are large, and when the excavator rotates, time consumed from a static state to a constant speed state is short, and work efficiency is greatly improved. Meanwhile, the contact area of the double rotary motor and a gear ring of the excavator is large, the borne unit area is small, and the service life of the excavator can be greatly prolonged. Internal oil channel design is optimized, the sealing mode of a one-way valve and the like is changed, so that the leakage amount becomes small, and energy waste is reduced.