The invention discloses a color gamut matching method for a multimedia device, comprising the following steps: a video signal received by the multimedia device is subjected to color gamut mapping and is output, the color gamut where the video signal is located is a first color gamut, and a display color gamut of the multimedia device is a second color gamut; the color gamut matching method for the multimedia device comprises the following steps: the received video signal is converted into a brightness signal and a chromaticity signal, a two-dimensional face is obtained by calculation according to the brightness signal and the chromaticity signal, a first domain is obtained by the tangency of the two-dimensional face and the first color gamut, and a second domain is obtained by the tangency of the two-dimensional face and the second color gamut; the position of a to-be-matched point of the video signal in the first domain is obtained by calculation according to the brightness signal and the chromaticity signal of the video signal, the to-be-matched point is calculated to obtain a matching point in the second domain, and a matching point signal is output.