The invention discloses a light force cooling miniaturized high-precision optical gravity meter. The gravity meter comprises a vacuum chamber, a release device, a laser cooling chamber, an optical detection chamber and a micro-nano ball; the laser cooling chamber and optical detection chambers are located above and below the middle of the vacuum chamber respectively; the laser cooling chamber comprises two lenses, and two horizontal parallel light beams adopt two vertical polarization states output by the same laser; focal points of the two lenses overlap with each other and form a light trapregion; the optical detection chamber comprises two lenses, the focal points of the two lenses overlap with each other at the focal point to form a detection region; the release device is provided with a release outlet, and a cooling light source is arranged under the vacuum chamber, and the cooling light source emits cooling light upwards to shine on the light trap region. Accordingly, the micro-nano ball is utilized as a measuring carrier, a laser cooling technology is combined, the release position and capture position of the ball are accurately measured to obtain a precise value of gravitational acceleration, environmental interference is eliminated, the gravitational acceleration measurement accuracy of gravity acceleration is improved, and the measuring speed and efficiency are improved.