The invention discloses an ignition coil case edge-cutting device, which comprises a rack, a loading device, a discharging device, a feeding mechanism, an installation base, a cutting device and a positioning device. The feeding mechanism is movably arranged on the rack; the loading device and the discharging device are arranged on two ends of the rack; two loading troughs are arranged on the feeding mechanism; a plurality of self-aligning mechanisms are arranged in each loading trough; a cross guide rail is arranged on a side wall of the installation base; a second sliding seat is arranged onthe cutting device and is movably arranged on the cross guide rail; the positioning device is arranged on one side of the cutting device; a positioning support rod and a pushing mechanism are arranged on the positioning device; and the pushing mechanism is connected with an electromagnetic push rod. The loading device is adopted for loading, the feeding mechanism can be used for conveying an ignition coil case to be cut to the positioning device so as to carry out trimming and cutting, and the cut case is conveyed to the discharging device so as to be discharged, so that the production efficiency can be improved.