A photoetching or evaporation process mask cover , comprising a bracket and at least one adjusting unit , each adjusting unit including a shielding plate and a driving component , the bracket having an opening portion , and at least a portion of the opening portion corresponding to the adjusting unit , wherein the shielding plate has a first end and a second end, the second end is fixed on the bracket , the first end is an end opposite to the second end, and the first end is closer to the opening portion of the bracket than the second end; the shielding plate in an initial state is provided on a side of the opening portion ; the driving component is installed on the bracket , is provided on a side of the first end away from the second end and is connected with the first end of the shielding plate , the driving component is configured to drive the first end of the shielding plate to move in a first direction (A), so that at least a portion of the shielding plate is released from the side of the opening portion , to adjust a size of a portion of the opening portion covered by the shielding plate along the first direction (A), and the first direction (A) is a direction from the second end to the first end of the shielding plate ; the bracket is provided with an accommodating component for accommodating the shielding plate in the initial state; and the accommodating component includes a shielding plate rotating shaft , the shield plate rotating shaft has an axis line perpendicular to the first direction (A) and parallel to an extending plane of the opening portion , the second end of the shielding plate is connected with the shielding plate rotating shaft , and the second end of the shielding plate is wound around the shielding plate rotating shaft in the case that the shielding plate is in the initial state. the shielding plate has a first end and a second end, the second end is fixed on the bracket , the first end is an end opposite to the second end, and the first end is closer to the opening portion of the bracket than the second end; the shielding plate in an initial state is provided on a side of the opening portion ; the driving component is installed on the bracket , is provided on a side of the first end away from the second end and is connected with the first end of the shielding plate , the driving component is configured to drive the first end of the shielding plate to move in a first direction (A), so that at least a portion of the shielding plate is released from the side of the opening portion , to adjust a size of a portion of the opening portion covered by the shielding plate along the first direction (A), and the first direction (A) is a direction from the second end to the first end of the shielding plate ; the bracket is provided with an accommodating component for accommodating the shielding plate in the initial state; and the accommodating component includes a shielding plate rotating shaft , the shield plate rotating shaft has an axis line perpendicular to the first direction (A) and parallel to an extending plane of the opening portion , the second end of the shielding plate is connected with the shielding plate rotating shaft , and the second end of the shielding plate is wound around the shielding plate rotating shaft in the case that the shielding plate is in the initial state. <EOS>