The invention discloses a method for measuring a foundation frame at a continuous-casting sector-shaped section. According to the method, a self-made auxiliary tool is matched with a total station in the prior art to finish accurate measurement in the installation process of the foundation frame at the continuous-casting sector-shaped section, so that the elevation of the axis of a bearing bush for supporting one end of the sector-shaped section on the foundation frame at the sector-shaped section, the distance relative to the reference line of an outer arc and the elevation of a supporting plate for supporting the other end of the sector-shaped section can conform to the accuracy standard. The method disclosed by the invention has the advantages that a great amount of fund does not need to be invested for buying and using foreign equipment and special measurement instruments, and the measurement of the foundation frame at the continuous-casting sector-shaped section can be accurately finished under the condition without high-accuracy special measurement instruments, so that the construction expense is reduced, the construction cost is saved, the measurement accuracy problem difficult to solve in installation and construction of an existing foundation frame at the continuous-casting sector-shaped section is effectively solved and the convenient condition is provided for guaranteeing the installation accuracy of the equipment.