High-frequency invert direct-current point-welding device

The invention discloses a high-frequency inversion direct current spot welding machine, comprising a three-phase rectifying circuit, an inverter circuit, a high-frequency transformer, a rectifying and filter circuit and a DSP controller. The primary coil and the secondary coil of the high-frequency transformer are wound into layers alternately, and an insulating layer is arranged between two adjacent layers; the primary coil layers are held between the secondary coil layers, and both the inner layer and the outer layer of the primary coil layers have the secondary coil layers; the secondary coil is wound into layers by thin copper strips, and each layer has one turn; the secondary coil layers of the inner layer and the outer layer are both layers of even numbers, the secondary coil layers of the inner layer are serially connected, and the current directions of adjacent layers are opposite; and the secondary coil layers of the outer layer are also serially connected, and the current directions of the adjacent