The invention provides a tomography method for utilizing preliminary wave limited frequency earthquake travel time. The tomography method comprises (a) obtaining originally collected data by performing outdoor exploration collection, and picking the preliminary wave travel time on original shot gather; (b) building an initial velocity model according to elevation and coordinate information of an observing system; (c) performing dynamics ray tracking on the initial velocity model, and calculating a travel time field and a green function; (d) calculating a chromatography matrix according to the travel time field and the green function, obtaining a model update amount by solving; and (e) updating the initial velocity model and judging whether inversion accuracy is met.