The invention relates to a convenient conversion device for a dry type transformer tap switch. The convenient conversion device comprises two pliers parts, wherein the two pliers parts are connected through metal flexible connecting bands; each pliers part comprises a jaw, a connecting shaft and a handle, each jaw is of a duckbilled structure, and the outer surface of each jaw is covered with thecorresponding metal flexible connecting band; and a butterfly bolt is installed between the handles. The commissioning test of a dry type transformer is carried out by using the convenient conversiondevice, and the working time can be shortened into about one third of existing time, so that the working efficiency is improved, and the working strength is reduced.