An inverter direct-current resistance welding machine high-frequency transformer, comprising a main transformer and a rectifier radiator. The main transformer comprises several primary wire packets (1) and several secondary wire packets (2). The rectifier radiator comprises two lead plates (41) and a centre tap (47). Each of the secondary wire packets is formed by attaching a plurality of thin copper plates (21). An insulating sheet (22) is provided between the thin copper plates. The structure of each of the thin copper plates is that a through hole (211) for an iron core to pass through is provided in the centre thereof, a notch (212) is provided at a side portion, and two ends (213, 214) disconnected at the notch are respectively connected to the lead plates and the centre tap. Thus, the electromagnetic coupling strength between the primary wire packet and the secondary wire packet is enhanced, the transmission power and efficiency of a transformer are improved, the heating quantity of the transformer is reduced, and the volume and weight of a high-frequency transformer are reduced.
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