A day-mode-night-mode switching method is applied to a monitoring camera apparatus or a filter switching module. The monitoring camera apparatus is electrically connected to an supplemental lighting apparatus for light compensation. The day-mode-night-mode switching method can include acquiring an equivalent exposure parameter of the monitoring camera apparatus, determining whether the equivalent exposure parameter conforms to a first mode switching condition when the monitoring camera apparatus is in a night mode, computing a light compensation exposure parameter of the monitoring camera apparatus when the equivalent exposure parameter conforms to the first mode switching condition, utilizing a compensation parameter acquired by the light compensation exposure parameter to transform the equivalent exposure parameter into a predicted exposure parameter, and switching modes of the monitoring camera apparatus according to a determination of the predicted exposure parameter and the first mode switching condition.