The invention discloses a bidirectional trailer type model test device. The device comprises a trailer; a first ship model and a second ship model which are distributed at an interval are arranged below the trailer; the tail part of the second ship model and the tail part of the first ship model are oppositely arranged; the longitudinal symmetry center line of the first ship model, the longitudinal symmetry center line of the second ship model and the moving direction of the trailer coincide with one another; the first ship model is fixedly provided with a first fixing device, the second shipmodel is fixedly provided with a second fixing device, and the first fixing device and the second fixing device are fixedly connected with the trailer through connecting parts respectively; a first force measuring instrument is arranged on the first fixing device, and a second force measuring instrument is arranged on the second fixing device. The two ship models can be measured in one round, theworking efficiency is obviously improved, and the scheduling contradiction of a ship model test water tank is effectively solved.