An improved portable aquarium filter structure has a box body, wherein its inside has a submersible pump externally connected to an air pipe. Air enters the submersible pump through the air pipe to mix with water flow pumped by the submersible pump so as to produce bubbles. Accordingly, water flow can be treated with bubble removing and purification. A bubble collection box is disposed on the box body to collect filth that is treated with bubble removing, wherein an opening is disposed on the bubble collection box. A converged taper section is disposed at the opening wall of the opening extended toward the box body therein. The filth is decomposed to produce carbon dioxide and acid gas by a protein decomposition unit disposed in the bubble collection box to attract mosquitoes entering the Trap through the tapered opening so as to achieve a goal of catching mosquitoes.