The invention provides an aluminum tube crimping device. The device comprises a cover and a base, and has the improvements that crimping dies are arranged in a cavity formed by the cover and the base arranged on a crimping machine; the axis of the base is provided with a connecting rod respectively connected with the crimping dies and crimping pinchers of the crimping machine. Compared with the prior art, the aluminum tube crimping device provided by the invention can be used for adjusting dimensions of the crimping dies according to the external diameters of to-be-crimped aluminum tubes so as to adapt to the crimping of the aluminum tubes of various specifications. The aluminum tube crimping device is simple in structure, easy to install and operate, reliable in crimping effect and high in economic efficiency, and suitable for being popularized and used.