Method and apparatus for measuring thickness using color camera

The invention discloses a method and device for measuring thickness using color camera. The method includes filtering operation, light strength obtaining operation, scanning operation and curve graph drawing operation. In filtering operation, a sound light adjustable filter is used for filtering a plurality of wavelengths in a plurality of wavelength range of light emitted of a white light source. In light strength obtaining operation, a color camera is used for obtaining light strength signals of a plurality of wavelengths in a plurality of wavelength ranges at the same time. In scanning operation, a plurality of light strength signals in each wavelength range are obtained through repeated filtering operation and light strength acquiring operation in a condition that scanning is performed in each wavelength range at predetermined intervals at the same frequencdy with wavelengths. The curve graph drawing operation integrates a plurality of light strength signals so as to manufacture the curve graph about all