The invention relates to a thermal confluence bus-piping waste heat recovery and utilization system, whose thermal source is air medium. It is characterized in that at least two thermal air sources are connected with the channel of thermal air source respectively; each channel of thermal air source is connected one way of three-way wind door; another channel of three-way wind door is connected with the bus pipe of thermal confluence by connecting pipes; the bus pipe of thermal confluence is connected with the waste heat recovery device; the third way of three-way wind door is connected with by-pass channel; the protection device of generating device of thermal air source can be assigned on the channel of thermal air channel directly; the control equipment of thermal confluence is connectedwith the generating device of thermal air source, the three-way wind door and controlling and measuring component on the waste heat recovery and utilization device by control circuit. The merit of invention is that multiple thermal air sources are combined to enter into a waste heat recovery and utilization device so that waste recovery is realized easily and it is provided with high recovery efficiency, compact structure, small occupied area, easy assignment, easy running and maintenance and few spare parts.