The nozzle flame jet from the rocket engine during sea-landing recovery can have a significant impact on the recovery platform. Understanding the features of the nozzle flame jet flow field is crucial for the design of the recovery platform. The three-dimensional N-S equations and k-ε turbulence model are adopted. A simplified geometric model of the recovery platform is obtained based on a typical condition where the rocket is 4 meters away from the platform with a protective wall on the right side. Based on these models, a numerical simulation model for the features of the nozzle flame jet during sea-landing recovery is established. Using this simulation model, the features of the rocket nozzle flame jet flow field were numerically calculated.