The utility model discloses a culture dish airing device, which mainly comprises a bracket, a drain pipe and a collecting groove, wherein the bracket comprises a plurality of vertically put upright posts and a plurality of support plates; the support plates are fixedly arranged on the upright posts and are vertical to the upright posts; a plurality of through holes are formed in each support plate; a hollow pipe which is matched with the through hole in diameter is fixedly arranged on each through hole; a guide plate is arranged at the lower end of each support plate; an included angle is formed between each guide plate and each support plate; one end of each guide plate is fixedly arranged on the corresponding support plate; the other end of each guide plate is fixedly arranged on the drain pipe and is communicated with the drain pipe; and the collecting groove is located at a water outlet of the drain pipe. A culture dish is inversely fastened on the hollow pipes, so that the residual water drops in the culture dish flow to the guide plates through the hollow pipes and the through holes in the support plates and finally enter the collecting groove through the drain pipe. The culture dish airing device is simple in structure; air circulation is achieved when the culture dish is aired; the airing time is shortened; and the culture dish airing device is fast, convenient, clean and free of pollution.