An ultraviolet curing device is proposed, which includes a light source assembly, and a first reflection plate and a second reflection plate connected to the light source assembly and disposed at two sides of the light source assembly, respectively. Both of the first reflection plate and the second reflection plate are scalable along lengthwise directions to make the distance between the light source assembly and the to-be-cured display panel adjustable and make all the ultraviolet rays from the light source assembly be able to be used to cure the to-be-cured display panel.