Ultraviolet curing device and ultraviolet curing method

The invention provides an ultraviolet curing device and an ultraviolet curing method. The ultraviolet curing device comprises a transparent base table, a first supporting assembly, a second supportingassembly and an alignment assembly; the transparent base table is configured to support a mask plate for curing; the first supporting assembly is configured to support a box-aligning base plate; thesecond supporting assembly is configured to be in contact with an edge region and support the transparent base table; and the alignment assembly is configured to conduct the alignment adjust to the box-aligning base plate and/or the mask plate. According to the ultraviolet curing device provided by the embodiment, a liquid crystal area in the box-aligning base plate is shielded through the mode inwhich the transparent base table is used for supporting the mask plate to move up and down, the problems that the mask plate falls off and a film layer falls off are solved, and the service life of the mask plate is prolonged;