The invention provides a drilling hydraulic differential type density transducer steady-current bearing device, and belongs to the technical field of oil and gas exploration. The drilling hydraulic differential type density transducer steady-current bearing device structurally comprises a transducer supporting rod and a transducer pressure diaphragm piece. The transducer pressure diaphragm piece is arranged on a rod body of the transducer supporting rod. The outer periphery of the transducer supporting rod where the transducer pressure diaphragm piece is located on is provided with a ball cover. The ball cover is formed by connecting an incident flow surface half ball cover and a back flow surface half ball cover in an oppositely buckled mode. The transducer supporting rod penetrates through a ball shell in the longitudinal axis direction. A drooping falling opening is defined at the bottom end by an incident flow reverse rotating curved wing and a back flow reverse rotating curved wing. The transducer supporting rod extends downwards and penetrates out of the drooping falling opening. Nose wing holes are evenly formed in the one-third concentrated area of the ball crown surface ofthe back flow surface half ball cover, and the nose wing holes facing the consistent direction form a nose wing hole filtering net. By means of the drilling hydraulic differential type density transducer steady-current bearing device, density measurement errors are eliminated, accurate density data are provided for establishment of a safe drilling fluid system, the drilling hydraulic differentialtype density transducer steady-current bearing device is advantageous to the safety of drilling construction, and the density of a drilling fluid is truly reflected.