Air pipe assembly measuring device and measuring method

The invention discloses an air pipe assembly measuring device and a measuring method.The air pipe assembly measuring device comprises a positioning block, a fixing assembly, a core rod, a first measuring block and a second measuring block, the positioning block comprises a mounting part and an auxiliary measuring part, and the auxiliary measuring part comprises a measuring inclined surface and a measuring vertical surface facing an air pipe assembly; an included angle formed by the measuring inclined surface and the measuring vertical surface is beta; the fixing assembly is arranged on the mounting part and is used for mounting the main pipe body, so that the main pipe body is vertically arranged; the core rod comprises an embedding part and a detection part, and the embedding part is used for being embedded into the connecting section and enabling the outer circle of the detection part to be coaxial with the central axis of the connecting section; the first gauge block is provided with a first not-go-end bul