A video signal processing method, comprising the steps of performing color space conversion on a to-be-processed video signal to obtain a first non-linear RGB signal; converting the first non-linear RGB signal based on an electro-optical transfer function, to obtain a first linear RGB signal; performing luminance mapping on the first linear RGB signal to obtain a second linear RGB signal, wherein a luminance value range corresponding to the second linear RGB signal is the same as a luminance value range corresponding to a display device; performing color gamut conversion on the second linear RGB signal to obtain a third linear RGB signal, wherein a color gamut corresponding to the third linear RGB signal is the same as a color gamut corresponding to the display device; converting the third linear RGB signal based on an optical-electro transfer function, to obtain a second non-linear RGB signal; performing color space conversion on the second non-linear RGB signal to obtain a first luminance-chrominance signal; and performing saturation mapping on a chrominance component of the first luminance-chrominance signal to obtain a second luminance-chrominance signal, wherein the step of performing luminance mapping on the first linear RGB signal comprises: calculating a temporary luminance value based on each primary color value of the first linear RGB signal; converting the temporary luminance value based on a preset luminance mapping curve, to obtain an adjustment coefficient; and multiplying each primary color value by the adjustment coefficient to obtain the second linear RGB signal, and wherein the step of performing saturation mapping on the chrominance component of the first luminance-chrominance signal comprises: converting the temporary luminance value based on a preset saturation mapping curve, to obtain a saturation factor; and multiplying a product of the saturation factor and a preset chrominance adjustment factor by a chrominance value of the chrominance component, to obtain an adjusted chrominance value. performing color space conversion on a to-be-processed video signal to obtain a first non-linear RGB signal; converting the first non-linear RGB signal based on an electro-optical transfer function, to obtain a first linear RGB signal; performing luminance mapping on the first linear RGB signal to obtain a second linear RGB signal, wherein a luminance value range corresponding to the second linear RGB signal is the same as a luminance value range corresponding to a display device; performing color gamut conversion on the second linear RGB signal to obtain a third linear RGB signal, wherein a color gamut corresponding to the third linear RGB signal is the same as a color gamut corresponding to the display device; converting the third linear RGB signal based on an optical-electro transfer function, to obtain a second non-linear RGB signal; performing color space conversion on the second non-linear RGB signal to obtain a first luminance-chrominance signal; and performing saturation mapping on a chrominance component of the first luminance-chrominance signal to obtain a second luminance-chrominance signal, wherein the step of performing luminance mapping on the first linear RGB calculating a temporary luminance value based on each primary color value of the first linear RGB signal; converting the temporary luminance value based on a preset luminance mapping curve, to obtain an adjustment coefficient; and multiplying each primary color value by the adjustment coefficient to obtain the second linear RGB signal, and wherein the step of performing saturation mapping on the chrominance component of the first luminance-chrominance signal comprises: converting the temporary luminance value based on a preset saturation mapping curve, to obtain a saturation factor; and multiplying a product of the saturation factor and a preset chrominance adjustment factor by a chrominance value of the chrominance component, to obtain an adjusted chrominance value. converting the temporary luminance value based on a preset saturation mapping curve, to obtain a saturation factor; and multiplying a product of the saturation factor and a preset chrominance adjustment factor by a chrominance value of the chrominance component, to obtain an adjusted chrominance value.