Hydrostatic test device for composite insulator

The invention provides a composite insulator hydraulic test device, and belongs to the technical field of insulator test devices. The test device comprises a device base, the device base is provided with a supporting structure used for supporting the transversely-arranged composite insulator, the device base is further provided with sealing cover pieces used for sealing end openings in the two ends of the composite insulator, the sealing cover pieces are provided with water injection openings used for being communicated with an inner cavity of the composite insulator, and the device base is provided with a guide rail. At least one sealing cover piece is movably installed on the guide rail in a guiding mode to form a movable sealing cover piece, and the device base is further provided with a clamping driving mechanism used for driving the movable sealing cover piece to move so that the sealing cover pieces at the two ends can be matched to clamp the composite insulator. During a test, the composite insulator i