The invention discloses a composite titanium heat exchanging pipe which comprises an inner titanium layer and an outer titanium layer. An aluminum-zinc alloy layer is arranged between the inner titanium layer and the outer titanium layer, and a molybdenum-titanium alloy layer is arranged on the outer side of the outer titanium layer; and side wings arranged in the length direction of the titanium heat exchanging pipe are arranged on the outer side wall of a titanium heat exchanging pipe body, and the ends of the side wings are connected with outer side wall of the titanium heat exchanging pipe body in a circular arc mode. According to the composite titanium heat exchanging pipe provided by the invention, the corrosion resistance is greatly improved, the fund investment of manufacturers is reduced, the area of contacting with a fluid is increased, the heat exchanging efficiency is greatly improved, and the composite titanium heat exchanging pipe has good application prospects and is worthy of being popularized.