The invention provides a turbofan qualification detecting method. The method includes following steps: step S01, suddenly starting and stopping a turbofan for at least one time; step S02, normally starting the turbofan; step S03, collecting pressure and flow signals of the turbofan in the process of the step S02, and forming a pressure-time curve and a flow-time curve; step S04, judging whether the pressure-time curve and the flow-time curve are within a preset range or not. In this way, the turbofan doesn't need to be mounted on a whole machine to test whether it is qualified or not, so that quality and yield of whole machine products are improved. The invention further provides a turbofan qualification detecting device by which quality and yield of the whole machine products can be improved.