The invention discloses a port state supervision simulation system, which includes a control center and a plurality of PSCO training terminals. The control center is connected with the multiple PSCO training terminals through a local area network, and the control center conducts maintenance management and initialization setting for a backend database through an administrator terminal. The invention further discloses a method for simulated training through the simulation system. The method includes the steps of S1, training scene defect setting; S2, three-dimensional scene roaming; S3, certificate file checking; S4, checking key point reminding; S5, operational checking of instruments and equipment; S6, checking process recording; and S7, checking report writing. According to the port statesupervision simulation system, by integrating port state supervision standard procedures into virtual ships, equipment on the virtual ships can be operated like real ships, the virtual characters aredisplayed, the ship defect scene and PSC inspection work scene are simulated, and the problem that PSCO real ship training is restricted by the shipping date, the time, the cost and other factors iseffectively solved.