Electric signal transmission in the drilling oil-based drilling fluid environment is one of the current research hotspots. To solve this problem, a high-frequency inductive coupling transmission device is designed to solve the problem. The core transmission part is an inductive coupling transmission coil.In this paper, through HFSS simulation and laboratory model testing, an inductive magnetic coupling transmission coil structure is designed, which can be used to solve the problem of inductive coupling trans-mission of complex drilling tools downhole. The simulation model establishes a multi-coil transmission model to study the law of induction transmission characteristics of different turns in different media conditions. Based on this law, a corresponding physical model is designed. The results of actual measurement show that the transmission gain effect is good. High gain(-20dB)is obtained both in simulating water-based drilling fluid and the case of oil-based drilling fluids, and conventional modulation and demodulation circuits can be used to realize signal transmission and processing, and have conditions for inductive transmission in a variety of media. Therefore, the device lays a foundation for the complex drilling tool induction transmission and the measurement while drilling signal transmission in a variety of media conditions, which is of great significance for engineering applications.