A nebulizing device (100) is provided, including: a hollow housing (101), including a cavity (110). where the cavity (110) includes a liquid channel (111) located inside the cavity and a nebulizing spray nozzle (103) located at a distal end of the liquid channel (111) with a plurality of fluid outlets; and an injector (102), at least partially accommodated in the cavity (110). The injector (102) includes: a reservoir (120), configured to accommodate liquid; a liquid conveying pipe (121) including a liquid inlet (122) and a liquid outlet (123), where the liquid inlet (122) is located in the reservoir (120), the liquid outlet (123) is located in the liquid channel (111), the liquid outlet and the nebulizing spray nozzle (103) jointly define a liquid chamber (124), and the liquid conveying pipe (121) is configured to convey the liquid in the reservoir (120) into the liquid chamber (124); and an injector proximal end (102), which is coupled to the liquid conveying pipe (121) and configured to receive a pushing force, so that the liquid conveying pipe (121) is movable in the cavity (110) from a proximal position to a distal position to form a predetermined nebulizing pressure at the nebulizing spray nozzle (103), and the liquid can flow out through the nebulizing spray nozzle (103) and converge to generate a plume spray with a predetermined initial speed, where at least 50% of droplets in the plume spray have an average particle size ranging from 1 um to 10 um.