The invention discloses a template sewing machine with an electromagnetic tension adjuster, which comprises a station platform, a machine frame, a head, a splint, a longitudinal groove, a moving beam and a sliding block, and is characterized in that: the head is provided with an electromagnetic The tension adjuster, the electromagnetic tension adjuster includes a tension disc, a mounting screw, an electromagnetic coil and an armature, and the electromagnetic coil is connected with the control unit of the template sewing machine. Compared with the prior art, the present invention has the following advantages: the electromagnetic coil is connected to the control unit of the template sewing machine, so that the current line speed can be read through the control unit, and the estimated range of tension should be controlled, and then realized by controlling the magnitude of the current in the electromagnetic coil For the automatic control of tension, such a scheme can promote the intelligent process of the template sewing machine, further realize automatic control, and reduce labor costs.