Abstract: China Railway has accumulated and precipitated a large amount of data. Railway big data with large amount of data, complex structure and diverse sources need a new architecture model for data storage and calculation. In order to meet the needs of the development of railway big data, this paper studied and designed the architecture of railway big data platform. In order to meet the needs of the development of railway big data, this paper studies and designs the structure of railway big data platform, combines the big data technology with characteristics of different data sources, so that the platform can not only respond to the existing business quickly, but also dig deep into the value of massive historical data. It provides technical support for the storage and calculation of large amount of complex data and the improvement of data processing efficiency.