The invention discloses an FPSO (Floating Production Storage and Offloading) recycling assessment system, which comprises an input module, a preliminary design module, a risk assessment module, a technical assessment module and a decision module, wherein the input module is used for collecting the data of a new oil field and the design data of the FPSO in the initial operating oil file of the FPSO; the preliminary design module is used for carrying out superstructure preliminary design according to data input by the input module, ship body scale checking, mooring design, superstructure arrangement and an equipment specification; the risk assessment module is used for identifying risks and a seminar and cost assessment result according to a dangerous source distinguishing method; the technical assessment module is used for checking an existing ship situation and assessing and integrating new mooring and superstructure design to carry out lifetime extension assessment; and the decision module is used for concluding initial research, preliminary design, risk assessment and technical assessment results. By use of the system, a situation that a focus of attention is centralized to a problem irrelevant to recycling assessment due to information loss or human factors can be avoided, the criticality of each problem is sorted, the focus of attention is centralized to the key point of the problem, and a decision process is rationalized.