The invention belongs to the field of auxiliary tools for installing electric meters in power industry, and in particular relates to a wire connecting piece at a meter tail of an anti-larceny electric meter. The wire connecting piece includes a conductive tube and an insulating portion. The length of the conductive tube is equal to the depth of a wire guide of a measurement loop of the electric meter. The inner diameter of the conductive tube is smaller than the outer diameter of a wire insulated leather. The insulating portion is made of an insulating material and includes a wire insulated leather connecting tube and also a meter tail connection hole covering sheet which can fully seal the wire guide of the measurement loop of the electric meter. An upper portion of the wire insulated leather connecting tube is connected to and internally communicated with the tail portion of the conductive tube. The inner diameter of the wire insulated leather connecting tube is equal to the outer diameter of the wire insulated leather. The meter tail wire guide covering sheet is secured to an upper edge of the wire insulated leather connecting tube. According to the invention, the connecting piece can make the installation of the electric meter more reliable, is anti-larceny, has the characteristics of simple structure and low cost, and is easy for large-scale marketing.