Negative oxygen ion generator

The negative oxygen ion generator comprises a shell, a negative oxygen ion generating mechanism and an impact plate, one end of the negative oxygen ion generating mechanism is arranged in the shell, an air inlet channel and a first liquid inlet channel are formed in the negative oxygen ion generating mechanism, and the air inlet channel is used for introducing air and enabling liquid to be sucked into the first liquid inlet channel; gas in the gas inlet channel impacts the liquid to generate negative oxygen ions. The impact plate is arranged in the shell and used for enabling the negative oxygen ions containing the water mist to impact on the impact plate so that the water mist can be separated from the negative oxygen ions. High-pressure gas in the gas inlet channel impacts liquid flowing out of the first liquid inlet channel to generate negative oxygen ions, but the negative oxygen ions generated at the moment contain much water mist, the negative oxygen ions can be partially dissolved in water, the negativ