The embodiment of the invention relates to a video detection method, which mainly comprises the following steps of: acquiring a phase point to be detected from a static picture acquired by current video signal output; judging whether the phase point to be detected is within a predetermined phase point range; and if the phase point to be detected is within the predetermined phase point range, showing that the current video signal output is qualified. The embodiment of the invention also provides a circuit board detection method, a corresponding video detection device and a circuit board detection device. The video detection method, the circuit board detection method and the corresponding device in the embodiment of the invention can provide a detection standard for the video signal output, so the problem of an unstable detection result for video signal output detection by a detection mode dependent on subjective experience is solved. Therefore, the working efficiency is improved. Furthermore, the video detection device has simple operation and low cost, and the production cost is lowered.