Waste heat utilization system of rotary pellet shaft furnace

The utility model provides a waste heat utilization system for a rotary pellet shaft furnace. The waste heat utilization system comprises a waste heat utilization type shaft furnace, a weighing and conveying device, an auxiliary material preheating system and a dust removal system, the waste heat utilization type shaft furnace is used for roasting hot pellets; the auxiliary material preheating system is used for preheating auxiliary materials; the weighing and conveying device is used for conveying the preheated auxiliary materials discharged by the auxiliary material preheating system; the inlet end of the dust removal system is communicated with a flue gas outlet after heat exchange of the auxiliary material preheating system; a heat collecting device for collecting heat of exhausted tail gas is arranged at a tail gas exhaust port of the waste heat utilization type shaft furnace; a first heat source of the auxiliary material preheating system is a heat collecting device; the heat of the pellets is fully uti