Cascaded recycling system for waste heat of internal combustion generating set

The invention provides a cascaded recycling system for waste heat of an internal combustion generating set and relates to a smoke waste heat recycling system of the internal combustion generating set, which solves the problems of high smoke temperature of the internal combustion generating set, low energy utilization efficiency and low generating efficiency as smoke waste heat of the existing internal combustion generating set is directly recycled by an organic Rankine cycle system. The cascaded recycling system for waste heat of the internal combustion generating set comprises a steam Rankine cycle subsystem and an organic Rankine cycle subsystem; the steam Rankine cycle subsystem comprises a waste heat boiler, a steam turbine, a first generator and a delivery pump; the organic Rankine cycle subsystem comprises an organic working medium evaporator, an organic working medium preheater, an organic turbine, a heat regenerator, an organic working medium condenser, an organic working medium pump and a second generator; a superheated steam outlet of the waste heat boiler is communicated with an acting cycle working medium inlet of the steam turbine, and the organic working medium condenser is communicated with a second inlet of the heat regenerator. The cascaded recycling system is used for smoke waste heat recycling of the internal combustion generating set.