Abstract: A heat recovery apparatus and process for cracked gas are provided. The cracked gas comprises liquid feedstock cracked gas and gaseous feedstock cracked gas, and the apparatus comprises a heat recovery device for liquid feedstock cracked gas, a heat recovery device for gaseous feedstock cracked gas and a heavy component removal unit. The invention solves the problems in the art, i.e., incomplete heat recovery technology for cracked gas, insufficient control of viscosity of quench oil, high capital investment and large footprint of the equipment, as well as unstable operation and high energy consumption.