The invention discloses a method for rapidly detecting padimate in a cosmetic based on ion mobility spectrometry. The method employs ion mobility spectrometry for analysis and realizes direct sample introduction in an electrospray ionization manner. Analysis conditions are that an ionizationoun mode is a positive ion mode; ion source temperature is 170 DEG C; electrospray voltage is 3400 V; gas preheating temperature is 175 DEG C; the voltage of a migration tube is 7500 V; the temperature of the migration tube is 180 DEG C; migration spectral width is 25 ms; ion migration airflow velocity is 0.9 L/min; and the pumping speed of an exhaust pump is 0.52 L/min. The method for rapidly detecting padimate in the cosmetic based on ion mobility spectrometry is short in detection period and fast in analysis speed and can realize on-site rapid monitoring of product quality safety.