Micro-droplet fluorescence signal detection device using mixed exciting light as light source

The invention provides a micro-droplet fluorescence signal detection device. The micro-droplet fluorescence signal detection device comprises a light source synthesis module for synthesizing a plurality of lasers with different wavelengths into mixed exciting light; an objective lens which is located on a light conduction path of the mixed exciting light and can confocal the mixed exciting light on the micro-droplet to be detected so as to excite and generate a plurality of different fluorescence signals corresponding to different lasers, and collimate the plurality of different fluorescence signals into parallel light; an optical processing module which comprises a convex lens and an optical fiber, and the first end of the optical fiber is located on the focus of the side, away from the objective lens, of the convex lens so as to receive and transmit a plurality of different fluorescence signals focused on the convex lens; and a signal receiving module used for processing a plurality of different fluorescenc