Cleaning device and cleaning method

The invention discloses a cleaning device and a cleaning method, relates to the technical field of printing screen plate cleaning, and provides a technical scheme capable of realizing automatic cleaning of a printing screen plate under the condition that the printing screen plate is not dismounted. The cleaning device comprises a cleaning mechanism, a first movement mechanism, a second movement mechanism and a third movement mechanism. The cleaning mechanism is arranged on the first movement mechanism, the first movement mechanism is arranged on the second movement mechanism, and the second movement mechanism is arranged on the third movement mechanism; the first movement mechanism is used for driving the cleaning mechanism to move to the position below the printing screen plate, the third movement mechanism is used for driving the second movement mechanism so as to drive the first movement mechanism and the cleaning mechanism to move towards the printing screen plate until the cleaning mechanism makes contac