Heat exchanger of air heater for station wagon

The utility model relates to an air heater heat exchanger for a station wagon, which is characterized in that both the inner surface and the outer surface of a cylindrical inner sleeve (1) are convex-concave, the cylindrical inner sleeve (1) is inwards provided with a convex inner fin (4), the cylindrical inner sleeve (1) is outwards provided with a convex first outer fin (5), the first outer fin (5) is provided with a convex rod (6) on at least one of two opposite side surfaces of the first outer fin (5), and the outer surface of the first outer fin (5) is provided with a convex groove (7). The cylindrical inner sleeve (1) is provided with at least one pair of first outer fins (5) and second outer fins (5 '), and the protruding rods (6) of the adjacent first outer fins (5) and second outer fins (5') on the two opposite side faces are alternately distributed. Heat generated by heating of an existing heater for the station wagon can be effectively utilized, the airflow heat exchange capacity is improved, and e