Internal combustion engine waste heat recovery device

The utility model relates to an internal combustion engine waste heat recovery device, one side of a connecting pipe is detachably provided with a baffle, an installation structure comprises a threaded rod and a pressing block, the threaded rod is installed on the outer wall of the connecting pipe in a threaded mode, one end of the threaded rod is connected with the pressing block in a rotating mode, and the pressing block is located on the inner side of the connecting pipe. A rotating block is welded and fixed to the other end of the threaded rod, one end of the connecting pipe communicates with a waste heat recovery pipe, a heat exchange coil pipe is fixedly installed in the waste heat recovery pipe, a heat-conducting medium inlet and a heat-conducting medium outlet are formed in the two ends of the heat exchange coil pipe, and one end of the heat-conducting medium inlet communicates with a water outlet of a water pump; the exhaust pipe waste heat utilization device is installed outside an exhaust pipe thro