Elevator key disinfection device and elevator key disinfection method

The invention provides an elevator key disinfection device and an elevator key disinfection method. The elevator key disinfection device comprises a driving assembly, a gear transmission assembly, a telescopic push rod, a clutch assembly, a disinfection brush assembly and a spraying assembly, wherein an input gear of the clutch assembly is meshed with a driven end of the gear transmission assembly, an output sleeve is fixedly arranged outside a rotary transmission shaft in a sleeving mode and is provided with a contact part, and an elastic piece is configured with a pre-tightening force which enables one side surface, facing the contact part, of the input gear to abut against the contact part. The elevator key disinfection method comprises the following steps that when an elevator is detected to be in a no-load state and a preset disinfection time point is reached, a disinfection mode is started; and when the preset disinfection time is reached, people are carried in the elevator, the disinfection process is