The invention discloses a reactive compensation capacitor switching control method, which aims at an existing TSC type reactive compensation device and is used for controlling selection of an equal-capacity capacitor matched with the TSC type reactive compensation device and switching-on and switching-off actions of an unequal-capacity capacitor bank in sequence. The method comprises the five steps of reactive load trend judgment, reactive power demand calculation, judgment of whether the capacity of the compensation capacitor is allowed to be increased or decreased, capacitor selection and capacitor switching sequence judgment. By using the control method provided by the invention, the influence of instant under-compensation and overcompensation caused by disordered switching among unequal-capacity capacitor banks in the reactive compensation capacity switching process can be reduced, and the problems of capacitor selection and service life optimization during equal-capacity compensation can be solved. The control method has important significance for improving the reactive compensation effect, the voltage quality and the economical efficiency of a power distribution network.