The invention relates to a multifunctional detecting device for flow field measurement and a detecting method applying the multifunctional detecting device. The detecting device comprises a probe rod, at least one probe, and/or a sampling device, wherein the probe and/or the sampling device are/is fixed on the probe rod. A probing end of the probe and a sampling end of the sampling device extend out from the same end of the probe rod. Through the multifunctional detecting device for the flow field measurement and according to a flow field parameter needing to be measured, the same end of the probe rod is provided with the probes and/or the sampling device, and therefore the device is simple in overall structure, achieves the goal that a plurality of parameters at the same position in a flow field are measured at the same moment, lowers workload of the flow field measurement, at the same time, eliminates position difference, caused by multiple times of measurements in the prior art, of the probe and the sampling device when being inserted sequentially and errors caused by the difference of parameters of the flow field at different moments, and improves precision of measurement.