The utility model provides a hydraulic packer. The hydraulic packer is characterized by comprising a central tube, an upper sealing rubber sleeve, a hydraulic locking mechanism and a lower sealing rubber sleeve, wherein the upper sealing rubber sleeve, the hydraulic locking mechanism and the lower sealing rubber sleeve are sequentially arranged on the periphery of the central tube from top to bottom; baffle rings or annular flanges are arranged at the two ends of the central tube respectively, and the baffle rings or the annular flanges are used for stopping the upper sealing rubber sleeve or the lower sealing rubber sleeve; a hydraulic channel for providing hydraulic power for the hydraulic locking mechanism is formed in the central tube, and the hydraulic locking mechanism is used for compressing the upper sealing rubber sleeve upward and compressing the lower sealing rubber sleeve downward. Due to the fact that the hydraulic packer is provided with the two rubber sleeve seals, the sealing effect of the packer is greatly improved. Furthermore, the central tube is provided with the hydraulic channel, a hydraulic pipeline in the pit can achieve the function of passing through the hydraulic channel, and hydraulic pressure can be transmitted to the other side of the packer.