The invention provides a method for evaluating water injection well profile control injectivity. The method includes the specific steps that firstly, a data sequence of profile control injection pressure and corresponding time is acquired, and a relation curve of the profile control injection pressure and the corresponding time is drawn; then, area integration is conducted on a relation function of the change of the injection pressure along with the time, and the corresponding accumulated time is divided by the area integral; finally, a profile control injection pressure index is obtained. According to the method, the injectivity of a profile control agent, the relative development degree of a reservoir dominant channeling path, the permeability contrast and the like are reflected with the profile control injection pressure index, and guidance is provided for decision making in the profile control technology; meanwhile, data needed for calculating the profile control injection pressure index is simple and convenient to record, and compared with the traditional climbing pressure parameter, the method can reflect the dynamic change of the profile control construction pressure more accurately and has higher practicability in evaluating the profile control technology and the implementation effect.