A new type of flow sensor integrated with uniform velocity tube and vortex is proposed in this paper, which can simultaneously measure the dual-parameter measurement of the differential pressure signal and frequency signal. According to the different extraction methods of the vortex signal, they are divided into piezoelectric type and differential pressure type. The structure, theory, signal acquisition methods of the two flow sensors are mainly designed and expounded in this paper, and the measurement characteristics of them are compared through gas and water. The experimental results show that the combination of the differential pressure flow sensor and the empirical wavelet transform (EWT) can widen the range ratio from 10:1 to 140:1. The absolute value of the maximum measurement error of single-phase gas is reduced from 1. 46% to 0. 49%, and the repeatability is reduced from 0. 17% to 0. 05%. The absolute value of the maximum measurement error of water is also reduced from 1. 00% to 0. 49%, and the repeatability is lower than 0. 07%. Compared with the piezoelectric flow sensor, the differential pressure uniform velocity tube vortex flow sensor has certain application advantages in measurement accuracy and measurement range, and provides a new idea for wet steam measurement.