In order to increase the intelligent level of trenchless equipment in our country, and upgrade the hydraulic system of drilling rig from the transmission function to the intelligent control function to achieve proper drilling, an intelligent multi-functional directional drilling system has been developed. The system also protects the motor from the “overspeed”, “overpressure” and “ air-vacuum” phenomena that are prone to occur during drilling, relieves the pressure impact of the system through the compensation of the pump displacement, and intelligently matches the engine power according to the load to prevent the engine from stalling.