A spatial light modulator and a liquid-crystal module are provided. The spatial light modulator includes a first liquid-crystal module and a second liquid-crystal module that are arranged opposite to each other. The first liquid-crystal module includes a first array substrate, a first color filter substrate, and a plurality of first spacers disposed therebetween. The second liquid-crystal module includes a second array substrate, a second color filter substrate, and a plurality of second spacers disposed therebetween. The first array substrate, the first color filter substrate, the second color filter substrate, and the second array substrate are stacked sequentially. At least one first spacer forms a first overlapped unit, and at least one second spacer forms a second overlapped unit. An orthographic projection of the first overlapped unit on the first array substrate fully overlaps an orthographic projection of the second overlapped unit on the first array substrate.