Power head with composite vibration reducing device

The invention relates to a power head with a composite vibration reducing device. The power head comprises a power head box body, left and right connecting plates, a carriage and a wheel hub, wherein the wheel hub is coaxially mounted in the power head box body; the power head box body is connected with the carriage through the left and right connecting plates and a pin shaft; the carriage is mounted on a mast of a rotary excavating drill main engine; a composite vibration reducing device is arranged on the power head box body, and comprises a first-stage vibration reducer, a second-stage vibration reducer and a third-stage vibration reducer; the third-stage vibration reducer comprises an inner cylinder, an outer cylinder, a spring and a base; the inner cylinder can slide in the outer cylinder; the spring is arranged between the inner cylinder and the outer cylinder; and the periphery of the spring is filled with an elastic material. The power head is provided with the composite vibration reducing device, so that the vibration reducing effect is good, the impact power absorbability is high, and when the power head is acutely impacted in work, the power head and other parts on the power head can be protected against damage.