According to the different scale evaluation needs of urban waterlogging risk evaluation in Xining City, a multi-scale urban waterlogging risk assessment method is proposed, which covers the macro scale of urban planning management, the meso scale of block early warning and emergency response and the micro scale of loss insurance assessment. Entropy weight method is used for macro scale assessment of urban waterlogging, hydrological and hydrodynamic simulation is used for meso scale assessment, and disaster damage curve method is used for micro scale assessment. The results show that 25 of the 36 drainage districts in Xining City are located in comprehensive high and medium risk areas. 75% of the 12 measured ponding points are located in the comprehensive high-risk areas and 16.7% in the comprehensive medium risk areas.