A mask, a manufacturing method thereof, a fine metal mask, a mask device and a use method thereof are provided. The mask includes at least one opening region and a shielding part surrounding and defining the at least one opening region. The shielding part includes a main part and at least one protrusion, in each opening region, the protrusion is protruded towards the opening region on a side of the main part facing the opening region; the main part includes an edge disposed on a side of the protrusion opposite to the opening region and with an extension direction being a same with an extension direction of the protrusion, the protrusion and a portion of the main part disposed between the edge and the protrusion includes a thinning portion with a thickness being less than a thickness of other portions of the shielding part.