Disclosed is a display method of a multi-primary color sphere display device. The method includes the steps of: dividing a pixel color gamut into color patches; determining a color patch to which a pixel chromaticity coordinate belongs; displaying through three dynamic sub-pixels according to the color patch to which the pixel chromaticity coordinate belongs; and determining output brightness of the dynamic sub-pixels by coordinates of a white point, coordinates of the dynamic sub-pixels, an output brightness value when gray level 255 in red is input, an output brightness value when gray level 255 in green is input, and an output brightness value when gray level 255 in blue is input respectively. When input gray level values of RGB three pixels are approximately the same, output brightness and white chromaticity are basically close to the same, guaranteeing the consistency of the chromaticity coordinates of the white point.