Day and night switching method and device, camera and storage medium

The embodiment of the invention provides a day and night switching method and device, a camera and a storage medium, and relates to the field of video monitoring. The method comprises the following steps: firstly, when a day and night mode of a camera is a black and white mode, determining first environment illumination according to the illumination intensity of each turned-on light supplement lamp and a preset conversion relation, and superposing the first environment illumination to a first preset threshold value as a switching threshold value; and then, the camera obtains the second environment illumination in real time, and determines whether to switch the day and night mode from the black and white mode to the color mode according to the relationship between the second environment illumination and the switching threshold. The switching threshold value for switching from the black and white mode to the color mode is automatically adjusted according to the illumination intensity of the turned-on light supp