The invention discloses a test device, and belongs to the boat machinery field; the test device comprises a mounting rack, a test platform, a test platform support, a drive mechanism and a plurality of first rod shape telescoping assemblies; the test platform support is movably arranged on the mounting rack; one ends of the plurality of first rod shape telescoping assemblies are respectively hinged to the test platform support; one ends of the plurality of first rod shape telescoping assemblies are respectively hinged to the test platform; the drive mechanism can drive the test platform support to make reciprocating motions in the vertical direction, thus enabling the test platform to simulate stormy wave fluctuations; the plurality of first rod shape telescoping assemblies are hinged between the test platform support and the test platform, thus enabling the test platform to have various degrees of freedom; the test device can control the telescoping length of each first rod shape telescoping assembly, thus enabling the test platform to rotate and incline in various directions; in addition, the test platform support can make reciprocating motions in the vertical direction, thus simulating the complex sea environment, and improving the test accuracy.