To reveal pressure distribution and attenuation law of shock wave in bifurcated tubes, a modular bifurcated tube model was built for shock wave propagation test. The overpressure of shock wave at each measuring point under different membrane breaking pressures and different bifurcation angles was obtained, and the attenuation curve was fitted with Rankine-Hugoniot equation. The pressure velocity correlation algorithm of FLUENT was used to simulate the propagation process of shock wave at the tube bifurcation and observe the distribution of pressure flow field in tubes. The results show that the bifurcation angle has a significant impact on the pressure distribution of the main tubes and branch tubes. The attenuation rate of shock wave in the tubes is related to the membrane breaking pressure. Among the three bifurcation tubes of 30 °, 90 ° and 150 °, the platform pressure of 90 ° branch tube is the lowest. Under the same membrane breaking pressure, the attenuation rate of branch tubes is opposite to main tubes.