The invention provides a detection method for measuring a blade center hole, which is simple and fast, can effectively enhance the detection efficiency and has high detection precision. The invention also provides a special measuring appliance for measuring the blade center hole, which comprises a proof stick. The special measuring appliance is characterized by also comprising a center hole measuring head and an auxiliary measuring plate. When the special measuring appliance is used for measurement, a blade is positioned and clamped into a moulding surface measuring appliance, the center hole measuring head is arranged in the blade center hole, then the auxiliary measuring plate is installed to ensure the clamping foot of the auxiliary measuring plate to be attached to the end surface of a frame of the moulding surface measuring appliance without gap, the center hole measuring head is slightly pressed by hands, and the value of a gap between an excircle of the center hole measuring head and a datum plane of the auxiliary measuring plate is detected by the proof stick, thereby a practical position of the blade center hole can be detected.