The invention relates to a measuring method of Laves phase content of T/P 92 steel. The measuring method comprises the following steps: S1, sample preparation; S2, observing a sample under an SEM (Scanning Electron Microscope): optionally selecting at least five fields, respectively taking photos of a secondary electron (SE) and a back scattered electron (BSE) in a magnification time of 2500-5000; S3, identifying Laves phase particles: in the photo of the back scattered electron, compared with a M23C6 particle, the contract between the Laves phase and a matrix is higher, the luminance is larger, and determining the particle with a luminance different larger than 10% as the Laves phase; S4, image processing: carrying out binarization processing on the photos by image processing software Photoshop; S5, quantitative analysis of the image; and S6, statistical result processing. According to the measuring method of the Laves phase content of the T/P 92 steel provided by the invention, the sample preparation is simple, the operation is convenient, the range of viewing area is wide, the number of Laves phase particles of each field is large, and the distribution has statistical significance, so that the errors in subsequent quantitative results are small.