Digital switch

The invention discloses a digital switch, and mainly aims to solve the problem of inconvenience in disassembly and replacement since a mounting device for mounting a PCB (Printed Circuit Board) is mounted on side boards through screws in an existing digital switch. The digital switch is characterized in that a mounting device (2) comprises an underframe (21) and movable fastening parts (22) arranged at the two ends of the underframe (2); the movable fastening parts (22) are movably connected with the underframe (21); the inner sides of side boards (11) are provided with clamping parts (111); the front ends of the movable fastening parts (22) are provided with rim locks (221) which are in clamping fit with the clamping parts (111); the back ends of the movable fastening parts (22) are in clamping fit with the underframe (21); and the movable fastening parts (22) are in pulling-out fastening fit with a shell (1). According to the digital switch provided by the invention, the mounting device is arranged on the side boards in a clamping fit way, so that the digital switch is easy to disassemble and replace and firm in assembly, and can withstand bumping in a transportation process.