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The conventional adaptive fuzzy control technology for turboshaft aviation engine speed does not accurately adjust the engine speed and torque parameters, resulting in poor speed control effect. Therefore, a study on adaptive fuzzy control of turboshaft aviation engine speed is proposed. The logic is fuzzified, and the parameters of the fuzzy subset are taken as the main parameters of the controller to form a turboshaft aeroengine speed fuzzy controller. Through the fuzzy controller, the adjustment rules of the rate of change are designed to control the speed fluctuation in a small range, and a parameter adjustment rule table is established. According to the fuzzy Self-tuning numerical relationship, the engine speed and torque parameters are accurately adjusted. Based on this data, According to the membership function, with the Convex combination of adjacent modal controllers as the main mode, the derivatives of the same order are solved, and two buffer modes are set to converge the output state of the engine state to a certain extent, so as to carry out adaptive fuzzy control of the engine speed. Simulation experiments were conducted, and the results showed that using the method designed in this paper to adaptively fuzzy control the speed of a turboshaft aviation engine resulted in less engine speed fluctuation and better control effect, which has good application value.