Hybrid power system and operation machinery

A hybrid power system, comprising:

• an engine;
• a power distribution device;
• and
• a double-shaft extension motor, wherein:
• an output end of the engine is configured to drive a drive shaft of a walking system of an operation machinery, the operation machinery is provided with at least one set of hydraulic power system;
• an input end of the power distribution device is connected to the output end of the engine, a first power output end of the power distribution device is connected to one end of the drive shaft, the input end of the power distribution device is connected to the first power output end of the power distribution device;
• a second power output end of the power distribution device is connected to one end of the double-shaft extension motor, and the second power output end of the power distribution device is configured to selectively be coupled with the input end of the power distribution device or separated from the input end of the power distribution device;
• another end of the double-shaft extension motor is configured to connect with the hydraulic power system;
• and
• the power distribution device is provided with a power coupling state and a separation state;
• in the power coupling state, the first power output end of the power distribution device and the second power output end of the power distribution device form a power coupling connection, so that the engine is connected to the double-shaft extension motor;
• in the separation state, the input end of the power distribution device and the second power output end of the power distribution device are separated, so that the engine and the double-shaft extension motor are separated.