Ultraviolet LED automatic switching device for fluorescence detection

The invention discloses an ultraviolet LED automatic switching device for fluorescence detection. The ultraviolet LED automatic switching device comprises a platform, a stepping motor is fixed on theplatform, an output shaft of the stepping motor is in sliding connection with a bracket, a rotating plate is fixed on the output shaft, multiple ultraviolet LEDs with different wavelengths are arranged on the circumference of the rotating plate at intervals, and optical filers are arranged on the ultraviolet LEDs; a positioning part is further arranged on the rotating plate, a sensing element corresponding to the positioning part is arranged on the platform, and a sliding ring is connected on the output shaft in a sliding way. The ultraviolet LEDs with different wavelengths (200nm-500nm) can be automatically switched to irradiate different to-be-detected samples so as to perform laser fluorescence detection. The precise positioning can be realized, an optical path axis system can be automatically calibrated so as