In order to solve the problem of uncertainty evaluation management faced by front-line testers, an uncertainty evaluation management tool is developed based on client/server architecture. Sorting out the design ideas, put foruards the design requirements of wizard, tool and information. The overall design of the software is carried out from the aspects of system architecture, function planning and data relationship, and the realization of the core functions such as server calling Matlab program, auxiliary evaluation and auxiliary verification is emphatically introduced. Taking the auxiliary evaluation function as an example, the validity of the software function is verified by evaluating the uncertainty of the calibration factor of a small power pedestal. The results show that the software standardizes the uncertainty evaluation management process and the output expression of results, reflects the characteristics of good guidance, tools, information and network, meets the requirements of uncertainty evaluation management based on measuring equipment, and has a good prospect of popularization and application.