The utility model discloses an on -board bathymetric survey device, including support, pipe supporting slanting pole, tubular brace horizontal pole, the fixed iron sheet of pipe, scalable pipe, pulley, pulley support, lifting rope and pressure sensor, the support comprises three spinal branch rest base poles and three spinal branchs frame down tube, the pipe supporting slanting pole install in arbitrary plane of compriseing support sill bar and support down tube, pipe supporting slanting pole goes up even welding has a plurality of tubular brace horizontal poles, the fixed iron sheet both ends of pipe are fixed respectively on two adjacent support sill bars, one set is equipped with the pulley the endotheca outside of tubes wall upside scalable tub of one end is fixed to the pulley support, and another cover is equipped with the outer tube inner wall downside of the pulley support mounting of pulley at the scalable tub of other end, the one end of lifting rope is fixed with pressure sensor, and the other end passes pulley and the pulley on the outer tube on the scalable intraductal sleeve pipe in proper order. The utility model discloses can stretch out highly adjusting of outboard to the probe rod to adapt to not shipmate ship along the height.