The invention relates to a detecting method of phase color tube color fastness rapid aging. The detecting method comprises the following steps that S1, a phase color tube sample is placed in the innercavity of an experimental box body; the temperature range of the inner cavity of the experimental box body is 25-250 DEG C, the humidity is 10-100%, and the humidity is controlled by the quantity ofa chemical erosion solution injected into the experimental box body; S2, the chemical erosion solution is injected into the inner cavity of the experimental box body through a chemical erosion system,and the chemical erosion solution is an acidic solution or an alkaline solution; S3, a 2-20 kV alternating voltage is introduced to the inner cavity of the experimental box body through a high voltage terminal; and S4, a radial system is opened in the inner cavity of the experimental box body, thus a multi-factor simulation environment is formed, and rapid aging is conducted on the phase color tube sample; and a heating system, the chemical erosion system, the radial system, the high voltage terminal and a data detecting system are mounted on the experimental box body. According to the detecting method of phase color tube color fastness rapid aging, multiple factors are integrated to synergistically simulate and detect a phase color tube color fastness rapid aging law.