Rectifier transformers that provide power for electrochemical industrial rectifier devices are widely used in various fields, in order to improve the DC voltage waveform after rectification and the influence of higher harmonics of the rectifier device on the power grid and communication equipment, the number of phase on the valve side of the rectifier transformer is increased to six phases and twelve equal. Because the rectifier winding current is non-sinusoidal and contains many high order harmonics, in order to reduce the harmonic pollution to the power grid and improve the power factor, the pulse number of the rectifier equipment must be increased. The product has the characteristics of small footprint, easy maintenance and low loss. Widely used in hydrogen production, chemical industry, steel industry and so on.