The invention discloses a measuring scale of the position of a pipe fitting, comprising a left scale body and a right scale body. The left scale body and the right scale body are respectively provided with groove cavities matched with each other; the left scale body and the right scale body are hinged by rivets and fastening screws, wherein the left scale body is provided with an angle zero; the right scale body is provided with an angle index; a graduated scale with a clamp slot is fixed at the notch of the other end of the upper end surface of the right scale body; a staff gauge with scalesis inserted into the clamp slot; a tooth socket is arranged at the inner side of the staff gauge; a knob support is fixed at the inner side of the clamp slot of the graduated scale; the knob support is rotatably provided with a staff gauge knob; teeth are distributed on the annular side wall of the staff gauge knob; and the teeth and the tooth socket are matched with each other. The invention hassimple structure, convenient installation and use and high work efficiency and can more accurately measure the positions of parts arranged on the pipe fitting; the position measuring scale is especially suitable for the operation that the parts are required to be installed or welded on the pipe fitting.