Measurement method and measurement instrument of revolution body part

The invention discloses a measurement method and a measurement instrument of a revolution body part, wherein the measurement instrument comprises a base, a vertical post and an optical measurement head, wherein the vertical post is fixed on the base; the optical measurement head is movably assembled on the vertical post through a vertical orientation mode; a working platform which is used for placing and revolving a part is correspondingly arranged on the base below the optical measurement head; the working platform comprises a revolution platform and an angle displacement regulating platform which are arranged from bottom to top; the angle displacement regulating platform comprises a first angle displacement platform and a second angle displacement platform which respectively comprise a first deflection platform and a second deflection platform; and the deflection axes surrounded by the first deflection platform and the second deflection platform in rotation are vertical mutually and are both parallel to a plane of a light curtain of the optical measurement head. For the angle displacement regulating platform in the measurement instrument provided by the invention, by adopting the deflection surrounding the deflection axes parallel to the plane of the light curtain of a parallel light source through driving the two angle displacement platforms respectively by the revolution driving mechanism, the cross coupling regulation of the deflection angles of the working platform is realized, the space posture of a workpiece can be captured accurately, and the accurate positioning and measurement to the part are ensured.