Two-dimensional motion mechanism for underwater acoustic test

The invention relates to a two-dimensional motion mechanism for underwater acoustic testing, and relates to the technical field of underwater testing sensor positioning. The device comprises a guide rail seat, a horizontal displacement guide mechanism module arranged on the guide rail seat, a vertical displacement guide mechanism module arranged on the horizontal displacement guide mechanism module, and an acoustic measurement platform arranged on the vertical displacement guide mechanism module. According to the invention, acoustic testing can be carried out underwater, a multi-arm spiral line type hydrophone array is adopted, other noise and interference are inhibited by providing array gain, the measurement precision is high, metal materials are prevented from being used in a main body structure as much as possible, a sealed box body is filled with oil liquid, cavities are prevented from being generated as much as possible, and the influence of other structures on acoustic measurement is reduced; meanwhile