The invention relates to a micro-switch mounting structure for a microwave oven, wherein the microwave oven comprises an oven base / body internally provided with more than one locking device, an oven cavity for cooking food, and an oven cover / door hinged with the oven base / body, wherein the oven cover / door is provided with a fastening part connected to the locking device; at least one locking device is provided with a micro-switch; the locking device comprises a locking plate, and the locking plate and the fastening part are fixed with each other; the micro-switch and the locking plate are mutually separated; and the locking plate is provided with a switch touch block for triggering the switch button of the micro-switch. According to the invention, the locking plate and the micro-switch are arranged at different sides of a bracket, namely being mutually separated, and even the liquid in the oven cavity and at the outside flows to the locking device through the plug hole of the fastening part, the liquid cannot flow onto the micro-switch, so the efficient safe work of the micro-switch is ensured and the microwave oven has a more compact waterproof structure. The micro-switch mounting structure has the advantages of simple and reasonable structure, good waterproof property, safety, reliability and wide application range, and is convenient to operate.