A mounting plate and an optical inspection apparatus are disclosed. The mounting plate includes: a base plate; at least two first bars disposed above the base plate and extending in a first direction; and at least two second bars extending in a second direction. Each second bar being configured to be slidable in the first direction relative to the at least two first bars. The mounting plate may further comprises a third bar extending in the first direction and disposed between two adjacent first bars, the third bar being configured to be slidable in the second direction relative to the at least two second bars.