Hydrogen is a clean and efficient energy source with enormous potential for application and development prospects. However, hydrogen may cause leakage accidents during transportation, resulting in property damage and casualties. To solve this problem, it is necessary to design hydrogen probes to detect hydrogen leaks. This article is based on the principle that changes in hydrogen concentration in the air can cause changes in gas sound velocity, and changes in gas sound velocity can lead to changes in the phase of sound wave propagation. COMSOL software was used to simulate the design of hydrogen probes and achieve the simulation of hydrogen concentration measurement. A simulation was conducted based on the change in hydrogen concentration in the mixed gas inside the cavity, which can cause a change in gas sound velocity and subsequently lead to a change in sound wave phase. Simulations with different sound frequencies were attempted, and the simulation results showed that the hydrogen probe simulation design has good linear response and stability and can accurately detect hydrogen concentration in different concentration ranges. In addition, the simulation design of the hydrogen probe combines the advantages of low cost and easy preparation, making it suitable for a wide range of application scenarios. Therefore, this study provides important references for further optimization and application of hydrogen concentration detection probe design.