The embodiment of the invention discloses a method for removing organic matters in a zinc sulfate solution in zinc hydrometallurgy, comprising the following steps: A, demulsifying organic matters in the zinc refining solution into free organic matters under the emulsion breaking action of an ultrasonic wave air-flotation device; and B, separating the free organic matters from the zinc solution under the action of an air flotation device in the ultrasonic wave air-flotation device. In the embodiment of the invention, by utilizing the principle that different ingredients in the emulsion can be separated by different vibration actions of ultrasonic waves to different solutions, the organic matters in the zinc refining solution can be demulsified to form the free organic matters; and by utilizing the principles that the density of the organic matters is lower than that of the solution and the organic matters can be easily mixed with gas to be floated on the surface of the solution, the effect that the organic matters and the zinc refining solution are finally separated is achieved. By adopting the method, the organic matters in the zinc refining solution can be effectively removed, and the phenomena of plate burning or lower electrical efficiency in the electro-deposition process can be reduced.