Hydraulic milling machine

The utility model discloses a hydraulic milling machine, in particular to a milling machine with functions of hydraulic transmission, stepless speed change and overload protection for laying power grids. The hydraulic milling machine comprises a power unit, an actuating unit and a control system, wherein the power unit comprises an engine, the actuating unit comprises a hydraulic motor, a decelerator, a brake and a drum, and the control system comprises a control handle and an overflow valve. The engine is connected with a hydraulic pump, the hydraulic motor, the decelerator, the brake and the drum are connected in turn, and a variable pump is connected between the engine and the hydraulic motor. The hydraulic milling machine employs a shuttle valve to ensure normal feed of the brake, employs the overflow valve to control system overload, and employs the control handle to operate the variable pump to realize the function of stepless speed regulation. The brake is of a normally closed type, and only starts while feeding oil, therefore the brake locks when the engine suddenly goes out or hydraulic pipelines blow up. The hydraulic milling machine greatly increases constructional security, and has the functions of overload protection, no-voltage protection, stepless speed regulation and the like.