Aiming at the problem that the oil drilling downhole antenna works in a special environment composed of wellbore drilling fluid and strata, the wireless transmission signal loss is large and it is difficult to transmit reliably. Through simulation modeling, a new type of magnetic dipole antenna is designed. The features of interference and miniaturization enable reliable transmission of underground wireless data. Firstly, the HFSS three-dimensional simulation software is used to build a simulation model, and the key parameters such as the length of the antenna, the distance from the drill string body and the number of serpentine bends of the antenna are calculated in detail, and the parameter combination and frequency point law of effective transmission are obtained. According to this rule, the actual antenna is designed, and the simulation results are highly consistent with the actual test results. The return loss can reach below -7.5dB, and the parameters of the simulation design can meet the actual application requirements. The antenna design can be applied to underground wireless transmission in oil drilling, which can improve signal transmission strength, reduce antenna size, reduce system power consumption, and achieve reliable wireless signal transmission.