Abstract: A fluorescent auxiliary testing apparatus includes a light source module which emits a laser light to pass through a collimator, a dichroic mirror, and a first converging lens to project a testing object. The testing object emits a corresponding testing fluorescent light which passes through a filter assembly and a second converging lens and is received by a photo detector for generating a photoelectric signal. The photoelectric signal is transferred to a data processing equipment to perform test and analysis processes. The apparatus has a small size and a simple structure, and may be fabricated at a low cost.