Due to the complex and changeable geological conditions of the soft coal seam, sticking accidents often occur during the drilling construction of the drilling rig, which greatly reduces the work efficiency and seriously threatens the personal safety of workers. To solve these problems, an automatic anti-sticking electro-hydraulic control system is proposed. By analyzing the influencing factors of sticking, the rotary pressure of drilling rig is used to describe the state of sticking, and the threshold of slewing pressure sticking is set. According to the working principle of drilling rig and sticking mechanism, the anti-sticking hydraulic circuit based on the load flow independent distribution system(LUDV) is established. The automatic anti-sticking controller is established by PID and signal selector, and the seeker optimization algorithm(SOA) is used to adjust PID parameters. The system simulation test is carried out with AMESim. The results show that when the rotary pressure reaches 20 MPa, the drilling rig automatically pulls back; when the rotary pressure reaches 22 MPa, the drilling rig slewing pressure remains stable and a large slewing power is maintained to overcome the external load resistance and avoid sticking accidents, verifying the effectiveness of the automatic anti-sticking electro-hydraulic control system.