Optical measurement module capable of automatic calibration

The utility model discloses an optical measurement module capable of automatic calibration, which comprises a laser emission unit, a laser receiving unit, a gas chamber and a reflection unit, the laser receiving unit comprises a laser receiver, the optical measurement module further comprises a laser calibration unit installed on the gas chamber, the laser calibration unit comprises a hemispherical lens and a calibration lamp, and the hemispherical lens is installed on the gas chamber. The central optical axis of the calibration lamp penetrates through the center of the hemispherical lens and directly irradiates to the dead center of the laser receiver, light emitted by the calibration lamp penetrates through the hemispherical lens and then is received by the laser receiver, the power of the calibration lamp is controlled through the adjusting circuit, and the AD value displayed by the laser receiver is made to be equal to the AD value when particulate matter is extracted in the full scale. The power value is