To effectively control the discharge noise of urban landscape dams, the RNG k-ε turbulence model and FW-H acoustic model were used to simulate the flow field and noise of dam discharge. The influence of different hydraulic parameters on the discharge noise characteristics was analyzed. The results show that with the increase of flow rate or water depth over the weir, the discharge velocity and dynamic pressure increase, the degrees of water turbulence and vortex in the stilling pool intensify, and the sound pressure level and sound power spectral density of noise increase. With the increase of downstream water depth, the discharge velocity and dynamic pressure decrease, and the sound pressure level and sound power spectral density of noise decrease. The dominant frequency of discharge noise ranges from 500 to 1 000 Hz under different flow rates and downstream water depths, and it ranges from 500 to 1 200 Hz under different water depths over the weir. The discharge velocity is significantly positively correlated with the sound pressure level in the discharge area and the sound power spectral density in the non-overflow side wall area. The turbulent kinetic energy is significantly positively correlated with the sound pressure level in the discharge area and the sound power spectral density in the discharge section. The dynamic pressure is significantly positively correlated with the sound pressure level in each region and the sound power spectral density in the discharge area. There is a significant positive correlation between the vorticity and sound pressure level in the side wall area of non-overflow section. There is no significant correlation between the flow field factors and the main frequency of the discharge noise.