Portable wire tightener

The utility model relates to the technical field of electric power equipment, in particular to a portable tightener, which is characterized in that a fixed hook is fixed at one end of a shell; one endof the sliding shaft penetrates through the guide ring and then is fixedly connected with one end of the steel cable in the shell. A movable hook is fixed to the end, extending out of the shell, of the sliding shaft. The other end of the steel cable is fixed on a roller body of the winding roller; the rotating shaft is rotationally connected with the shell; one end of the rotating shaft extends out of the shell from the inner cavity of the shell and then is fixedly connected with the fixing plate; a handle rod is hinged to the fixing plate; the pin is inserted into the through hole; a bafflering is fixed on the body of the pin; a plurality of tooth grooves are formed in the surface of the shell; and the nail point of the pin is inserted into one of the tooth sockets. When the wire tightener is used, the self-lock