Hydraulic system of highway-railway dual-purpose cleaning and excavating machine

The invention provides a hydraulic system of a highway-railway dual-purpose cleaning and excavating machine and belongs to the technical field of engineering machinery. The hydraulic system comprises a working hydraulic unit, a walking hydraulic unit and an auxiliary hydraulic unit, wherein the working hydraulic unit is used for controlling and driving a clearing and excavating device; the walking hydraulic unit is used for controlling and driving a rubber wheel motor and a steel wheel motor; and the auxiliary hydraulic unit is used for controlling and driving a braking oil cylinder and a steering oil cylinder. The system relates to a complete hydraulic control and driving scheme in the highway-railway cleaning and excavating machine and can realize the functions of independently controlling crawler belts on two sides of the cleaning and excavating machine, independently operating a ditching device and an excavating device, flexibly adjusting the angle of the whole vehicle body and adjusting the cleaning and