The invention relates to a test device for diving masks. The test device comprises a bracket (1), a base (2), a hollow tube (3) vertically fixed on the bracket (1), and a head mould unit (4) movably installed on the base. A to-be-tested diving mask (5) is worn on the head mould unit (4). During test, the center of the mirror surface of the to-be-tested diving mask (5) is in contact with the bottom of the hollow tube (3). Compared with the prior art, the test device for diving masks has high efficiency and high accuracy, and is suitable for large-batch repeatability test.