A display device and a manufacturing method thereof are provided, and the display device includes a color filter substrate and an array substrate which are cell-assembled, the array substrate includes a first base substrate, an organic insulating layer is formed on the first base substrate, and a via hole is formed in the organic insulating layer; the color filter substrate includes a second base substrate, a main spacer and a secondary spacer is formed on the second base substrate, an orthogonal projection of the secondary spacer is located in an orthogonal projection area of the via hole on the first base substrate, and an orthogonal projection of the main spacer is located outside of the orthogonal projection area of the via hole on the first base substrate.