The invention discloses a characterization method of the sintering degree of rutile titanium dioxide particles. The characterization method is to measur the specific area of a rutile titanium dioxide sample to obtain the particle sintering degree through analyzing the measured specific area value, if the specific area value is small, the particle sintering of titanium dioxide is severe; if the specific area value is large, the particle sintering of titanium dioxide is mild or none. According to the invention, the specific area value of the rutile titanium dioxide particles is measured and obtained through a specific area tester and the particle sintering degree is obtained and characterized through analyzing the measured data; the characterization method is scientific, reasonable, simple, practical and strong in operability; a method for quantitatively measure the particle sintering degree of titanium dioxide is provided initially in the industry and the production of titanium white powder can be relatively well guided.