The invention discloses an activation system for activating PVC gel, which adopts a switching circuit connected with a PWM control module, realizes conduction of high direct-current voltage provided by a pressurization module for the PVC gel by utilizing a switch of the switching circuit. The power supply is used for supplying power to the activation circuit, and the PWM control module works under the power supply of the power supply to generate a series of PWM control signals. The boosting module amplifies the voltage for high-voltage activation of the PVC gel; in addition, the switching circuit is influenced by the PWM control module to work; when the PWM control signal is at a high level, the switching circuit is closed and conducted, and when the PWM control signal is at a low level, the switching circuit is disconnected and not conducted. Thus, on-off of a PVC gel activation high-voltage circuit is realized, adjustability of current in different periods is ensured, power and energy loss of activation of PVC gel are reduced, activation time is shortened, activation efficiency is improved, and the requirement for activation power of the PVC gel is met; meanwhile, the WM control module, the pressurization module and the switching circuit are adopted, the integration level is high, and miniaturization is facilitated.