The utility model discloses a detection apparatus for microorganism, include: a housing, the casing includes base and upper cover, base and upper cover form an accommodation space jointly, the upper cover can approximately be located hermetcally on the base, prop up supporting bench, it locates to prop up supporting bench in the accommodation space, the crystal oscillator device, the crystal oscillator device include the crystal oscillator support and install in crystal oscillator on the crystal oscillator support, the crystal oscillator device is located prop up on the supporting bench, the upper surface of crystal oscillator is equipped with the culture medium, simulation sunlight device, simulation sunlight device is located the top of crystal oscillator device, the light struck that simulation sunlight device sent arrives on the culture medium. The utility model relates to a culture time can be shortened, the detection apparatus for microorganism who detects the accuracy is improved.