Atmospheric molecules and aerosol particles have strong scattering effect on ultraviolet (UV), and the non-line-of-sight communication can be realized by using UV as the information carrier. The study of the pulse broadening effect in UV communication is very important for reducing the intersymbol interference and improving the system transmission rate. Based on the Monte Carlo method, the multiple scattering transmission model of the non-line-of-sight UV in the noncoplanar communication system is established. The whole process that UV is emitted from the transmitter and arrives at the receiver after multiple scattering is simulated. The results show that the full width at half-maximum of the impulse response of non-line-of-sight UV in the noncoplanar communication system will increase with the increasing elevation angle of the transmitter, the elevation angle of the receiver, and the deflection angle of the receiver. The contribution of multiple scattering to the pulse broadening increases with the increasing elevation angles of the transmitter and the receiver. The maximum code rate of the system will be reduced with the increasing elevation angle of the transmitter and the receiver by the on-off keying modulation mode.