In order to adapt to the intelligent requirement of marine piling construction in the new era, this paper creates a set of marine piling process deduction and intelligent decision system based on the Unreal Engine, which has the advantages of real-time rendering function of modelling, built-in rich blueprint resource library and open source code supporting, according to the 4 layers: basic support layer, model creation layer, data interaction layer and logic function layer. The system integrates multi-party construction information, provides managers with a visual management window of the construction environment and resources, creates construction logic according to the physical laws in the construction process, presents construction deduction of the whole marine piling process before construction, and takes real-time data from sensors as the control target, and performs intelligent decision of construction parameters in the piling process, so as to realise the scientific management and control of piling construction in severse sea conditions.