The invention relates to a tube-fin type parallel flow heat exchanger. The tube-fin type parallel flow heat exchanger comprises a plurality of flat pipe groups, multiple rows of rippled blind window combined fins and draining fin gaps, wherein the flat pipe groups are arrayed in row and column manners, and the rippled blind window combined fins are vertically arranged between two adjacent rows of the flat pipe groups; two ends of each rippled blind window combined fin are respectively vertical to two rows of the flat pipe groups, and the draining fin gaps are formed between two rows of flat pipes; and pipe diameter axes of the flat pipe groups are vertical to the flow direction of air, and cooling mediums are arranged in the flat pipe groups. According to the tube-fin type parallel flow heat exchanger, the efficiency of the heat exchanger is improved, and meanwhile, the problem of condensate water is effectively solved.