Harmonica capable of preventing mistaken blowing

The utility model discloses a harmonica capable of preventing blowing by mistake, and relates to the technical field of harmonica. The harmonica comprises a harmonica body and a blowing nozzle device, a blowing port is arranged on the blowing nozzle device, a blowing channel is arranged in the blowing nozzle device, the blowing channel is composed of a main flow channel and a plurality of branch flow channels, the blowing port is communicated with the plurality of branch flow channels through the main flow channel, and the plurality of branch flow channels are respectively communicated with a plurality of fret sound holes on the harmonica body. A plurality of key switches are connected to the blowing nozzle device in a sliding mode and arranged on the branch flow channels respectively. According to the utility model, the blowing nozzle device is arranged on the harmonica, so that a user only needs to blow through one blowing port, and the conducted branch flow channels are controlled through the key switch, t