The utility model discloses a heat supply and heat exchange station water supplementing device and belongs to the technical field of heat exchange station equipment. The water supplementing device ofthe heat supply and heat exchange station is energy-saving and environment-friendly. The waste heat recovery device is mounted between the primary water return pipe and the water supplementing tank; the waste heat recovery device recovers the waste heat of the primary water return pipe and transfers the heat to the water supplementing tank; the outer side of the water supplementing tank is coveredwith a heat preservation layer, a water supplementing pipe and a standby water supplementing pipe are communicated between the water supplementing tank and the secondary water return pipe, the watersupplementing pump and the standby water supplementing pump supplement water in the water supplementing tank to the secondary water return pipe through the water supplementing pipe and the standby water supplementing pipe respectively, and filters are installed on the water supplementing pipe and the standby water supplementing pipe. Waste heat of primary water circulation is recycled to water inthe water supplementing tank through the waste heat recycling device, resource waste is avoided, meanwhile, cost is reduced, the energy utilization rate is increased, and the purposes of energy conservation and environmental protection are achieved.