Fixing structure of pin of British plug

The invention relates to a fixing structure of a pin of a British plug. The fixing structure comprises a housing and the pin, wherein the bottom of the housing is provided with a jack, the jack comprises a first stepped hole and a second stepped hole sequentially disposed from top to bottom, the center lines of the first stepped hole and the second stepped hole are located on a same straight line,the pin comprises a fixing portion, a connecting portion and a working portion which are sequentially disposed from the top to the bottom, the cross-sectional areas of the fixing portion, the connecting portion and the working portion sequentially increase, a protective tube is disposed in the second stepped hole, the connecting portion of the pin is inserted into the protective tube, the fixingportion of the pin is inserted in the first stepped hole, the upper end of the fixing portion protrudes from the bottom of the housing, the outer surface of the upper end of the fixing portion is provided with a flange, and th