The invention provides a health assessment and diagnosis system for a nuclear industry site, and a mobile terminal, and the system comprises a feature extraction module, a knowledge base building module, a knowledge base binding module, a self-diagnosis module, and a comprehensive health assessment module. According to the system, a fault diagnosis technology based on multi-source information fusion is adopted; the invention discloses a multi-dimensional intelligent early warning technology based on a mechanism model. And a multi-dimensional comprehensive health assessment technology based onequipment-level and system-level process parameters. The comprehensive health information of the diagnosed and evaluated system and equipment can be comprehensively reflected; a fault source is capable of being quickly positioned, the defect that a traditional diagnosis and evaluation method only carries out fault diagnosis and evaluation on single-dimensional parameter variables or single-type parameter variables and single-device and single-system information is effectively overcome, and efficient prediction, rapid diagnosis and comprehensive health condition evaluation of the multi-dimensional parameter and multi-system coupling relation of the nuclear industry production line are achieved.