High quality cost-effective diesel drilling onshore large load workover rig,The rig structure is compact and well designed, highly integrated, and optimized to save working space. The power system is a hydraulic+ mechanical type with high comprehensive efficiency. A class II or self-propelled type chassis can be adopted to meet the various requirements of the end-users. The mast is front-open type, with a single section or double-section structure, hydraulic raising and hydraulic telescoping, or mechanical telescoping. Band brake or hydraulic disc brake can be applied as the main brake of the drawworks. The water cooling thrust plate pneumatic brake or water brake can be used as an auxiliary brake. The drill floor is a twin-body telescopic type or a parallelogram structure, both of which are convenient for installation and transportation. The dimension and height of the drill floor can be designed according to the end-user’s requirements.