The invention discloses a quick detection method for 
protein in milk. The method comprises the following steps: (1) preparing a 
sunset yellow solution as a detecting 
reagent; (2) preparing a series of standard 
protein aqueous solutions in concentrations, mixing the standard 
protein aqueous solutions with the detecting 
reagent, oscillating, centrifuging, taking supernate and diluting with water, preparing a standard color 
gradation card according to the solution color or using an 
ultraviolet and visible spectrophotometer for determining absorbancy at 483nm and drawing a 
standard curve; (3) mixing a to-be-detected 
milk sample with the detecting 
reagent, oscillating, centrifuging, taking supernate and diluting with water, comparing with the standard color 
gradation card or determining absorbancy at 483nm using the 
ultraviolet and visible spectrophotometer and calculating the content of the protein in the to-be-detected 
milk sample according to the 
standard curve. According to the method disclosed by the invention, the quick detection for the content of the protein in milk can be completed within 15-20min. When the method is adopted together with an 
ultraviolet spectrophotometer, the 
quantitative determination for the content of the protein in milk can be realized.