The invention discloses a hydraulic weighing unit and a ten-thousand-ton grade hydraulic electronic scale. The hydraulic weighing unit comprises a hydraulic cylinder, a control oil circuit, an oil pump and a pressure sensor; the oil pump controls the hydraulic cylinder through the control oil circuit; and the pressure sensor is arranged on the hydraulic cylinder, and is used for measuring the stress of the hydraulic cylinder. The hydraulic electronic scale comprises a displacement module and a stressed module, wherein the displacement module comprises at least three hydraulic weighing units, and each hydraulic weighing unit also is provided with a displacement sensor and a frequency converter; the frequency converter controls the oil pump of each hydraulic weighing units, and forms a position closed loop together with the displacement sensor; and the stressed module comprises at least one hydraulic weighing unit. Compared with the prior art, the electronic scale provided by the invention can conveniently weigh the weight of the ten-thousand-ton grade object, and can automatically collect and calculate the weight and gravity center data of the object.