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This application discloses a method for inverting insect wingbeat frequency based on initial phase calculation, relating to the field of radar measurement technology. The method includes: establishing a radar echo model of insect wingbeat motion containing amplitude and phase initial phases; acquiring micro-motion signals from the collected insect echoes based on the model to generate a micro-Doppler spectrum; calculating the phase initial phase value of the insect wingbeat based on the micro-Doppler spectrum; constructing a phase compensation factor based on the phase initial phase value to obtain a wingbeat parameter plane; detecting energy peaks in the wingbeat parameter plane based on the phase compensation factor; and determining the insect's wingbeat frequency based on the position of the energy peaks. This application, by introducing phase and amplitude initial phases, recreates the dual physical processes of wing movement and body micro-motion during insect wingbeat, making the radar echo model highly consistent with the actual signal generation mechanism, reducing errors, and improving anti-interference capabilities.