The invention provides a positive pressure type compressed gas bubble fire extinguisher, comprising a bubble tank body, a bubble generator, a fire extinguisher valve, a bubble nozzle and a connection pipe, wherein the bubble generator is arranged in the bubble tank body and used for feeding the premixed liquid of the bubble extinguishing agent in the bubble tank body to the bubble generator so as to form vaporous state, then impacting and mixing with the compressed gas in the bubble generator to produce the bubbles. Compared with the current bubble fire extinguisher, the positive pressure type compressed gas bubble fire extinguisher of the invention can realize the function of suppressing a fire with the same area through the premixed liquid of the bubble extinguishing agent of which the filling weight is only half of the filling weight of the premixed liquid of the current bubble extinguishing agent, and has covering performance. The speed of the sprayed bubbles is fast, the distance is far, the range is wide; simultaneously the bubbles are uniform and exquisite, and the stability is strong. The invention overcomes the shortcoming that the current negative pressure type bubble fire extinguisher influences the uniformity of the bubbles, which is caused by pressure fluctuation after absorbing air.