The invention relates to a high temperature cooler heating power check method and system. The method comprises the following steps that cooler inlet parameters and the quantity of heat exchange tube groups in a cooler are obtained, wherein each heat exchange tube group comprises a plurality of rows of tube bundles; and the cooler inlet parameters are used as an inlet condition of first-row tube bundles, an outlet condition of each row of tube bundles is used as the inlet condition of the next-row tube bundles, and heat transfer and pressure drop of all rows of tube bundles are calculated row by row. By means of the high temperature cooler heating power check method and system, according to the thought of calculating heating power characteristics of all tube bundles row by row in a heat exchanger, determination of high-temperature gas qualitative properties under the large temperature difference condition can be reduced, and the design error is reduced; and heat transfer, pressure dropand heat exchange tube wall temperature distribution, which cannot be given by a traditional heat exchanger heating power design checking method, inside the heat exchanger can be given, and it is conducive to timely find problems in the heat exchange scheme design stage to make modification and adjustment.