The embodiment of the invention provides an AC/DC conversion device and an AC/DC conversion system. The AC/DC conversion device comprises a three-phase matrix switch unit, a high-frequency transformer unit and a rectifier and inverter unit, wherein the three-phase matrix switch unit, the high-frequency transformer unit and the rectifier and inverter unit are sequentially connected in series. The series of a converter are reduced, the power conversion frequency is reduced, the efficiency of the system is improved, the topological structure is simplified, the volume and the weight of the system are reduced and conversion from DC to AC and from AC to DC is achieved.