The utility model relates to a copper plant low-grade waste heat recovery system for urban central heating. The system is characterized by comprising a primary network circulating pump and an in-copper-plant waste heat recovery device; primary network backwater from a primary pipe network flows in the in-copper-plant waste heat recovery device through the primary network circulating pump, the in-copper-plant waste heat recovery device collects waste heat in the copper plate for heating the primary network backwater, and the heated primary network backwater is provided for users in a primary network water supply manner; the in-copper-plant waste heat recovery device comprises an Ausmelt furnace wall waste heat recovery device, a converter body waste heat recovery device, a drying tower waste heat recovery device, an absorption tower waste heat recovery device, a slag pool waste heat recovery device and an in-copper-plant steam waste heat recovery device, wherein the Ausmelt furnace wall waste heat recovery device, the converter body waste heat recovery device and the drying tower waste heat recovery device are in parallel connection and serially connected with the absorption tower waste heat recovery device, the slag pool waste heat recovery device and the in-copper-plant steam waste heat recovery device. The copper plant low-grade waste heat recovery system for urban central heating is widely applicable to recovery of low-grade waste heat in a copper plant.