The electromagnetic acoustic transducer (EMAT) has low energy conversion efficiency and weak excitation signal, although the electromagnetic acoustic resonance (EMAR) technology based on long-period excitation signal for generating acoustic resonance can improve the signal-to-noise ratio of the received signal, it may cause the main pulse widen, enlarge the blind area of ultrasonic detection and reduce the measurement accuracy. In this paper, a broadband excitation electromagnetic acoustic resonance technology ( BEEMAR) and a Halbach array longitudinal wave EMAT are applied, a single-cycle broadband excitation is used as the EMAT input signal, and the EMAR method is used to measure the plate thickness of 7075 aluminum alloy specimens. The probability of detection (POD) model is used to characterize the measurement accuracy for micro metal plate thickness. The experiment results show that in the POD curves obtained with BE-EMAR under three signal-to-noise ratios when the noise is not reduced, the corresponding maximum difference of a50 or a90/ 95 is 0. 05 mm, while the maximum difference under the same signal-to-noise ratio before and after the noise reduction is 0. 07 mm. However, in the POD curve obtained with the time of flight (ToF) method the maximum difference is 0. 21 mm. Therefore, there is no significant difference between the results obtained with BE-EMAR before and after noise reduction, and the scheme is insensitive to conventional noise signals. Before and after noise reduction, in the POD curve obtained with BE-EMAR, a50 and a90/ 95 both can be stabilized within 0. 55 mm, which proves that the BE-EMAR has better accuracy, stability and anti-noise ability than ToF method in thickness measurement.