Abstract: To address the engineering problem that the inlet of the hydraulic cylinder in a traditional hydraulic liner hanger is normally open and is prone to premature setting caused by the false triggering of circulating pressure fluctuations, an electronic control mechanism for an intelligent liner hanger based on automatic pressure wave recognition was developed. This mechanism introduced the trigger mode of wellhead pressure wave coding instructions. By pressure signals acquisition with a downhole pressure sensor and recognizing the codes with a single-chip microcomputer, it drove the motor to control the opening and closing of the inlet on the hydraulic cylinder, realizing “normally close and open on demand” and fundamentally eliminating the risk of miss-setting. Structurally, an hollow mandrel was adopted to form an absolute pressure sealing cabin, internally equipped with a China made high-temperature-resistant and low-power-consumption electronic control system. The valve body was made of 2A12 aluminum alloy, and its strength was verified. Based on the Mooney-Rivlin constitutive model and finite element method, the sealing performance of rubber O-rings with different hardness under different pressures was systematically analyzed, and the matching between the sealing friction force and the motor pulling force was verified. The results indicate that the safety factor of the valve body is 1.16 under an ultimate pressure of 50 MPa, which meets the requirements for strength and drilling/ milling. The contact stress of a 90 HA nitrile rubber O-ring is always higher than the medium pressure under the conditions of 0 to 50 MPa, ensuring reliable sealing. The effective pulling force of the motor is significantly greater than the sealing friction force, ensuring stable operation. The surface pressure-bearing test verifies that the mechanism has good pressure-bearing performance, can effectively adapt to the complex conditions of high temperature and high pressure in deep wells, and provides a novel intelligent solution for the safe and efficient operation of liner cementing.