A gel plugging agent infusing filtering device comprises a filtering screen, an outer shell, an output pipe, an input pipe and a deslagging pipe. The filtering screen is installed in the outer shell. An inner cavity of the outer shell is divided into an outlet cavity and an inlet cavity by the filtering screen. The output pipe is arranged on the top portion of the outer shell. The output pipe is communicated with the outlet cavity. The inlet pipe is arranged on the lateral side of the outer shell. The input pipe is communicated with the inlet cavity. The deslagging pipe is arranged on the bottom of the outer shell. The deslagging pipe is communicated with the inlet cavity. According to the gel plugging agent infusing filtering device, solid impurity particles or fisheyes or polymer colloidal particles in gel profile control plugging agents can be filtered, blocking of pipe columns and immediate vicinity of wellbore is eliminated, profile control operation of the gel profile control plugging agent is enabled to be achieved smoothly, and the polymer flooding polymer solution is enabled to be infused in a stratum smoothly.