As an important indicator of measuring watt-hour meter products Watt-hour meter reliability prediction guarantee the safe and stable operation of the product has very important significance for design scheme of quantitative evaluation of watt-hour meter. In this paper, a Cloud Platform based on reliability prediction of watt-hour meter was designed by combining stress analysis of components and combining with the GJB/Z 299C-2006 expecting manual and IEC 62059 standard, which is used to analysis reliability. Both the failure rate of each component, each unit module and the whole watt-hour meter could be calculated quickly and accurately in accordance to the failure rate model of component on the platform. It can greatly shorten the time of Watt-hour meter reliability prediction and improve the reliability level of watt-hour meter. The platform provides personalized service so that potential problems were found during the designing phase, even to guide the design of watt-hour meter.