The dry ignition coil is a closed magnetic circuit ignition coil. The iron core of the coil is closed, and all magnetic flux passes through the iron core. The shell and high-voltage framework are made of high-performance plastic, high-temperature resistant enamelled wire and epoxy resin with good insulation. This kind of ignition coil has high energy conversion efficiency, high output voltage, good insulation performance, good heat dissipation, large product energy and long service life;