The invention relates to a measuring method of a molded aperture mask curved surface, which comprises the following steps: firstly, measuring three-dimensional coordinate values (x, y, x) of an in-screen curved surface and the aperture mask curved surface of a given pipe by utilizing three coordinates; secondly, fitting the measured coordinate values (x, y, z) of the curved surfaces by utilizing the three coordinates to a multi-term expression Z equaling to f(x, y); thirdly, obtaining the three-dimensional coordinate value (x, y, x) of the aperture mask curved surface of a pipe to be measured, and fitting the obtained three-dimensional coordinate value (x, y, x) of the aperture curved surface to the multi-term expression according to the formula Z equaling to f (x, y). The invention has simple principle, high measurement speed and high accuracy.