The invention discloses a sealing structure for a self-lubricating joint bearing for a hydraulic gate. The sealing structure comprises two oppositely disposed sealing rings, and the two sealing ringsare separately located in sealing grooves of bearing seat end covers at both ends of the bearing. The sealing grooves of the bearing seat end covers are second-order step grooves, and the sealing rings comprise annular connecting walls in a round platform side face shape. The large ends of the annular connecting walls are close to the bearing and provided with inner sealing rings located in the large ends of the second-order step grooves, and the small ends of the annular connecting walls are away from the bearing and provided with outer sealing rings located in the small ends of the second-order step grooves. The sealing structure for the self-lubricating joint bearing for the hydraulic gate adapts to the sealing effect in the process of rotation or reciprocating motion of the inner ringof the joint bearing and a shaft, and adapts to sealing in the process of horizontal deflection between the inner and outer rings of the joint bearing, that is, the sealing rings can slide and move inthe radial direction in the process of the horizontal deflection to achieve dynamic sealing, and the requirements of certain gate design which requires the bearing to perform settlement up and down in a bearing seat are met.