The invention belongs to the field of solar equipment, in particular relates to a hydraulic three-bar supporting solar tracking unit. In the unit, the arm A of a cross base is provided with a fixed-length supporting bar, a first hydraulic supporting bar is arranged on an arm C corresponding to the arm A and connected with the cross base by a hinge, a second hydraulic supporting bar is arranged onthe arm C or an arm D corresponding to the arm A and connected with the cross base by a round hinge, the fixed-length supporting bar and the second hydraulic supporting bar are connected with a solarpanel by the round hinge, a first hydraulic supporting bar is connected with the solar panel by the round hinge with a pin, a circuit control box is arranged on the cross base, and photosensor elements on the solar panel can control the operation of a motor by sensing the intensity of sunlight. Therefore, the unit of the invention can track the sun in all dimensions and receive the sunlight more effectively; the mechanical structure is compact, simple and reasonable; the horizontal steering and the vertical steering can not interfere with each other and have high flexibility; the unit also hasthe advantages of good dustproof property, low cost and excellent practicability.