The invention discloses a video image skin-tone detection method based on multi-color gamut selective morphology processing and is characterized in that: the mathematical morphology processing technology is introduced, video image data is input and passes through two parallel skin-tone detection modules based on RGB color gamut and YUV color gamut, pixels in the image are analyzed, selected and roughly judged whether the pixels are skin-tone pixels of the human body respectively in an RGB color space and a YUV color space under the control of a register operation management module MCU, the detection result is made a comprehensive judgment and analysis by a comprehensive judgment module for skin-tone detection, then a binary image obtained through the judgment is made a selective morphology filtering based on the content information in a selective morphology filtering module, finally the detected skin-tone is protected or processed under the control of the register operation management module MCU according to the need of the user to obtain the image which meets the visual habit of human eyes.