The present invention provides a toilet purging device that ejects gas, when a switch is operated. The toilet purging device includes a pipe body that has a gas channel through the pipe body, a firing unit that includes a firing pin disposed to be longitudinally movable and a switch for moving the firing pin to the pipe body when pushed. The firing pin is coupled to the upper end of the pipe body. The toilet purging device includes a tightening cap that is thread-fastened to the top of the firing unit with a gas container therebetween and moves the gas container to be in close contact with the firing pin when turned, and a connector that is coupled to the lower end of the pipe body and inserted into a drain pipe of a toilet.