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A two-dimensional axisymmetric model of the underwater explosion is established in this paper. After verification by empirical formula, the variation law of the reflection coefficient of the shock wave with different boundary sizes under different boundary conditions is studied. The results show that the peak pressure of the near-field shock wave is relatively close to the empirical formula. The calculated value of the far-field shock wave peak pressure is smaller than the empirical value, and refining the mesh can make the near-field shock wave peak pressure closer to Cole’s empirical formula; when the “Flow-out” boundary condition is set, with the increase of the proportional boundary size, the boundary pressure decreases and the reflection coefficient increases. When the proportional boundary size reaches 5, the reflection coefficient of the boundary is the same as that without the “Flow-out” boundary, which is close to 90%.

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