The invention provides an improved device for measuring blade type line chord width, which adopts a standard measuring instrument, and has a simple structure, quick and convenient operation and high measuring accuracy. The device comprises a vernier caliper and is characterized by also comprising a base and a height vernier caliper, wherein an I-shaped blade positioning block is arranged on the base; the height vernier caliper is arranged on the base through a fixing piece; and the vernier caliper is arranged on the height vernier caliper through a connecting piece.