The present invention relates to a high-voltage transformer coil with acoustic wave guiding function, which comprises a plurality of wound wires, an insulated material for packaging said wound wires to form a coil, a high-voltage connector formed on a side of said coil, and at least one wave guide formed on the other side of said coil to transmit acoustic waves generated due to discharge. The high-voltage coil for transmitting acoustic wave of the present invention is particularly suitable for cast resin transformers.