The invention relates to a focusing device and method. The focusing device includes: a device bracket; a turntable assembly, arranged on the device bracket. A feeding station, a first pre-feeding station, a first focusing station, a second pre-feeding station and a second focusing station are sequentially arranged in the circumferential direction of the rotary disc assembly. The first pre-electrifying station is used for pre-electrifying the camera module. The first focusing station is used for focusing the camera module for the first time in the pre-electrifying process. The second pre-power-on station is used for continuously powering on the camera module until power-on is completed. The second focusing station is used for carrying out definition recheck on the camera module which is focused for the first time and powered on, and carrying out focusing for the second time on the camera module when the definition of the camera module does not meet the preset requirement. According to the focusing device, on one hand, the focusing efficiency can be improved, and on the other hand, the focusing accuracy can be guaranteed.