DIN rail installation kit including main body, spring hook, latch fastener and elastic element and combined with electronic device. When latch fastener is pulled down first to move to second position, buckle of latch fastener pushes down on hook body of spring hook, and after passing under hook body, hook end of hook body can be temporarily positioned on side wall of latch fastener. When user releases latch fastener, elastic element returns latch fastener, buckle is then buckled on buckle portion of hook body, and second buckle means of latch fastener is kept away from first buckle means of main body to present a removable state. When latch fastener is pulled down secondarily to return to first position, buckle is separated from buckle portion of hook body, and second buckle means and first buckle means are relatively buckled on DIN rail to exhibit a state of tight coupling.