The present invention relates to an oil leakage detection method of a microphone circuit, a microphone circuit, a microphone and an electronic product. The oil leakage detection method of a microphone circuit includes: detecting an equivalent resistance and/or equivalent voltage in an environment where the microphone circuit is located through an oil leakage detection pin arranged on a microphone circuit package; determining whether the equivalent resistance and/or equivalent voltage exceeds a corresponding preset value through a detection circuit arranged in the microphone circuit package; and outputting a signal for stopping operation of the microphone circuit when the equivalent resistance and/or equivalent voltage exceeds the preset value. Adoption of the present invention can ensure that the detection circuit can normally work when an oil leakage accident occurs in the environment where the microphone circuit package is located, thereby reducing potential safety hazards of the electronic product.