Inorganic ultrafiltration membrane for water treatment. High-packing columnar ceramic membrane is made by sintering high-strength alumina at high temperatures, featuring excellent high-temperature resistance, chemical corrosion resistance, and outstanding mechanical strength. Compared to traditional multi-channel tubular ceramic membranes, a single high-packing columnar ceramic membrane tube has a filtration area of 10~25㎡, with greater packing density and processing capacity. It can effectively remove solid suspended particles, bacteria, and colloids, and is applicable in various fields such as safe drinking water for civilian use, municipal water supply and wastewater treatment, emergency water supply, water reuse, and industrial process wastewater treatment.