The invention discloses a pair of smart spectacles capable of automatically adjusting the transparency of lenses according to the ambient light intensity. The smart spectacles comprise a spectacle rack, left lens, a right lens, a control switch, a left film solar cell and energy storage device, a right film solar cell and energy storage device, an ambient light sensor an a control chip, wherein the left lens and the right lens are respectively embedded into two spectacle frame parts, and are divided into three layers, namely a first lens layer, a liquid crystal molecule interlayer and a second lens layer from outside to inside. The smart spectacles are capable of automatically adjusting the transparency of the lenses according to the intensity of ambient light to adapt with the illumination comfort level of human eyes; the ambient light sensor is used for converting the ambient light around the eyes into electric signals in a working state, treating by virtue of the control chip, and then outputting control voltage to the liquid crystal molecule layer of each lens interlayer. The light transmittance of each liquid crystal molecule layer is changed by changing the polarization state of liquid crystal molecules and combining a specific ambient light polarization state, so that continuous and automatic adjustment of the light transmittance of the lens adapting with the ambient light intensity is realized.