Heavy current transformer

The invention discloses a heavy current transformer, comprising a transformer main body; an iron core is arranged in the transformer main body; a winding skeleton is arranged on the iron core; a primary side winding is arranged on the winding skeleton; a secondary side copper busbar winding is arranged on the primary side winding; the secondary side copper busbar winding comprises an upper secondary winding output end copper busbar, a lower secondary winding output end copper busbar, an upper secondary winding vertical bending copper busbar, a lower secondary winding vertical bending copper busbar, an upper and lower vertical bending copper busbar connecting sheet and a stainless steel connecting rod. The transformer of the invention is advantaged by that the secondary side copper busbar winding forms a mouse cage structure through splicing; the heat radiation area is increased; the heat radiation area is optimized; the heat radiation effect of the transformer is enhanced; the size of the transformer is reduced; the actual application effect is good; and the transformer is beneficial for popularization.