The invention discloses a fault diagnosis system of an oil delivery process, and relates to a computer diagnosis system. The system comprises a server for operating installing. Net, wherein a PC (Personal Computer) machine is configured; a hard disk meets an operation system and a Windows xp 32 bit operation system; the system is characterized by comprising a communication module, a data storage module, a fault diagnosis module, a configuration module, a user management module, an operation module and a display module. Field data is acquired, and enterprise level opc (OLE for Process Control) service is established, so real-time data communication with opc is realized by using C++ language, the real-time data of the equipment is acquired, the data is stored in a cloud server, fault diagnosis of the oil delivery equipment is realized in real time with a data training fault detection model by using the cloud server, and remote browsing of equipment information, data management, management of equipment and management of a measuring point are realized through a web technology; finally a fault of the equipment is transmitted to a related responsible person by using a short message technology to remind overhauling equipment.