The invention discloses a three-phase non-isolated bidirectional DC/AC multi-port converter capable of expanding the number of DC ports, which comprises a DC part, a filter and an AC part. The DC partcomprises at least two DC units connected in parallel. Each DC unit comprises a DC voltage source and three bidirectional switches, wherein the three bidirectional switches are connected with one endof the DC voltage source at one end and are connected with the three ports of the filter near the DC part at the other end, and the other end of the DC voltage source is connected with the DC voltagesources in the other DC units. The three ports of the filter near the DC part are phases A, B and C respectively. The three ports of the filter near the AC part are connected with a three-phase powergrid or a three-phase load of the AC part. The converter realizes cooperative work of multiple DC sources by using bidirectional switch tubes, and has the advantages of simple structure, simple control, strong expansibility, wide range of working voltage, wide range of power regulation, and the like.