Bucket wheel excavator

The invention discloses a bucket wheel excavator which comprises a bucket wheel mechanism, a material receiving arm, an L-beam, a discharging arm (4), a walking mechanism, a large central gyrator and a small central gyrator, wherein the bucket wheel mechanism is arranged at the front end of the material receiving arm; the back end of the material receiving arm is hinged on the upper part of the L-beam; one end of the discharging arm is supported on the small central gyrator, and the other end of the discharging arm is connected to the top of the L-beam through a pull rod; the large central gyrator is arranged between the L-beam and a central frame; the small central gyrator is arranged on the central frame; the bucket wheel mechanism consists of a hydraulic motor, a bucket wheel speed reducer, a bucket wheel shaft, a bucket wheel body and a hopper; the bucket wheel shaft is arranged between two bearing seats at the front end of the material receiving arm; the bucket wheel speed reducer and the hydraulic motor are arranged at one end of the bucket wheel shaft, and the bucket wheel body is arranged at the other end of the bucket wheel shaft; and the hopper is fixed on the bucket wheel body. A power system of the entire bucket wheel excavator adopts a full-hydraulic mode, is provided with an engine, does not need to be connected with power electricity, has high yield, a wide application field, low noise and low pollution, and is free and flexible.