The utility model provides an aluminium trioxide filling capillary chromatographic column. A thick-wall glass tube can be filled by the fine particle of aluminium trioxide; can be pulled to a molding by adding glass softening point. Because the processing method of the filler aluminium trioxide adopts sylvite infiltration and section heating activation, the short chromatographic column can be used for achieving high separating power to the low carbon hydrocarbon. The utility model has the advantages of good stability and long service life; in addition, the both ends of the capillary column of filling glass are connected with a flexible quartz capillary respectively, which enhances the operability of the glass capillary column.