A display device and a manufacturing method thereof are provided, and the display device includes an array substrate, an opposite substrate and sealant frames between the array substrate and the opposite substrate, with a pre-cutting position disposed between two adjacent the sealant frames. The display device further includes a barrier layer between the array substrate and the opposite substrate and at a position corresponding to the above-mentioned pre-cutting position, and a material forming the barrier layer has an elongation at fracture smaller than that of a material forming the sealant frames. The display device can solve the problem of a large quantity of burrs caused by the sealant frames during the cutting process of a display screen under the precondition of reducing production costs.