The invention discloses a parallel multi input coupled inductor buck and boost converter which belongs to the technical field of power electronic converting. The converter is composed of N boost circuits, a buck circuit (20) and a load, wherein N is a natural number more than one. Each boost circuit is composed of an input source, a filtering inductor, a switch tube, a diode and a filtering capacitor. The buck circuit is composed of a switch tube, a diode, a filtering inductor and a filtering capacitor. The output ends of N boost circuits are connected in parallel and then are connected with the input end of the buck circuit (20). The output end of the buck circuit (20) is connected with the load. The filtering inductors of N boost circuits are respectively coupled with the filtering inductor of the buck circuit. According to the converter provided by the invention, a number of input sources power the load at the same time; buck and boost converting between input and output is realized; the filtering inductors are coupled with each other; the converter has the advantage of small size; different input sources and the load side can be respectively and independently controlled; and the control is simple.