Three-dimensional automatic optical detection device and control method thereof

The invention provides a three-dimensional automatic optical detection device and a control method thereof. The device comprises an image capturing part, a first lamp layer, a second lamp layer, a third lamp layer, a bottom lamp panel and at least four projection heads arranged on the peripheral side of the image capturing part, wherein the bottom lamp panel is arranged below the image capturing part, the first lamp layer is arranged on the peripheral side of the image capturing part, the third lamp layer is arranged in the bottom lamp panel, and the second lamp layer is arranged between the first lamp layer and the third lamp layer. The first lamp layer, the second lamp layer and the third lamp layer can project light of different colors; and the first lamp layer, the second lamp layer and the third lamp layer project light of different heights and different colors, and the light penetrates through the bottom lamp panel so as to form a multi-gray-scale picture capable of being collected on a circuit board to