The invention discloses a method for detecting a coumarins compound in a children toy. The method comprises the following steps of carrying out ultrasonic extraction on a toy sample to be detected inmethyl alcohol; preprocessing the sample to obtain an extracting solution; carrying out hollow fiber membrane liquid phase microextraction on the extracting solution, wherein an extracting agent is n-octyl alcohol; after filtering an extract liquor, adopting ultra performance liquid chromatograph-tandem mass spectrum analysis. The method for detecting the coumarins compound in the children toy provided by the invention is accurate, sensitive and reliable, and is applicable to actual inspection work and product quality control of the toy sample.