EGR cooler and engine

The utility model discloses a EGR cooler and engine. The EGR cooler includes shell, heat exchange tube group, end cover and adjusting device, and adjusting device includes rotation driving unit and the carousel of being connected with the rotation driving unit transmission, has first waste gas via hole on the carousel, the end cover include the lid and with lid stationary regulating plate, the waste gas that feeds through mutually with the first waste gas via hole entry has on the lid, a plurality of second waste gas via holes have on the regulating plate, each second waste gas via hole respectively with heat exchange tube group in a plurality of heat exchanger tube bundles of heat transfer area imbalance feed through mutually, the carousel has the rotation stroke for the regulating plate, in the rotation stroke of carousel, the first waste gas via hole feeds through with each second waste gas via hole in proper order mutually. The EGR cooler is can the row's of compromising temperature low, the EGR ratio is little and arrange that the temperature is high, two kind big operating modes of the EGR ratio, and more accurately according to the temperature of waste gas behind the different work condition control cooling, spare part arranges in the engine of being convenient for simultaneously.