The utility model discloses a shell and tube heat exchanger for a natural gas compressor. The shell and tube heat exchanger for the natural gas compressor comprises an upper shell and a lower shell which are fixedly installed in parallel; the upper shell and the lower shell form a communicated structure through steel tubes at the right side; the structure is compact; by effectively utilizing the size of an installation space, the arc bottom of the inner side of a left seal head of the upper shell is provided with an aerophobic baffle; the arc bottom of the inner side of a right seal head of the lower shell is provided with an aerophobic baffle, so that natural gas entering heat exchange tubes can be evenly distributed, and the heat exchange efficiency is greatly increased; grooves respectively provided with an elastic seal ring are respectively formed in the inner side face of the left seal head and the inner side face of the right seal head; the elastic seal rings are respectively arranged between the left seal head and a left tube sheet and between the right seal head and a right tube sheet, the left seal head and the left tube sheet are fastened through bolts, and the right seal head and the right tube sheet are fastened through bolts; the shell and tube heat exchanger is sealed by the elastic seal rings, so that the shell and tube heat exchanger has a good seal effect, and is not easy to leak, and the integral structure can also be reduced. The shell and tube heat exchanger disclosed by the utility model is convenient to use, simple in operation, lower in cost, safe and reliable.