The effect of the perforated plate on the premixed hydrogen-air flame quenching was experimentally investigated with various perforated plate lengths and initial pressures in a channel. The perforated plate has the same cross-sectional area and five lengths in the range of 20 mm, 40 mm, 60 mm, 80 mm and 100 mm. High-speed Schlieren photography was used to track the flame evolution, and correspondingly the flame front speed was calculated. Two piezoelectric pressure sensors were mounted upstream and downstream of the perforated plate to detect the local pressure. The results show that three kinds of flame phenomena were observed: "Pass", "Quench" and "Near limit". The "Pass" mode is characterized by successful flame propagation, and involving laminar flame, jet flame, and turbulent flame. Three pressure peaks can be observed on the pressure curve of the sensor in the upstream region. The first peak pressure is equal to two times the initial pressure. The flame tip speed in the downstream region decreases with the increase of the perforated plate length, and two pressure peaks were observed. In the "Quench" model, the flame does not successfully pass through the perforated plate. Furthermore, there are only two pressure peaks on the pressure curve in the upstream region and one in the downstream region. With the increase in the perforated plate length, the critical initial pressure for flame quenching also increases.