Trans-Media Aerial Underwater Vehicles (TMAUVs) are better adapted to complex conditions, but the trans-media process is a strongly nonlinear and unsteady process with violent changes. The hydrodynamic characteristics and motion stability during the water entry of the trans-media are the difficulties in research. Therefore, it is necessary to study the flow field characteristics and changes in the surface load of the trans-media vehicle under different conditions. Based on a morphing TMAUV underwater configuration, this paper uses CFD software to numerically simulate the water exit process under typical conditions. The results show that when the vehicle enters the water obliquely, the flow field and load on both sides appear asymmetrical changes. An attack angle that is either too large or too small will exacerbate the instability of the vehicle’s water entry. This non-rotary body vehicles will produce a large number of irregular bubbles during water entry. The research results can provide research ideas and theoretical guidance for the trans-media of vehicles.