The utility model discloses a sealed protective sleeve for cable joints. The utility model is mainly characterized in that sealing rings are formed by that semicircular sealing bearing bushes are connected with plane-shaped sealing strips; the sealing rings are arranged between two semicircular cylinder bodies which have the same structure; the semicircular sealing bearing bushes are embedded into semicircular grooves which are arranged at both ends of the semicircular cylinder bodies; the plane-shaped sealing strips are embedded in sealing grooves which are arranged along the assembly planes of the semicircular cylinder bodies; the surface of each of the sealing bearing bushes is provided with convex sealing ribs. When assembly is carried out on the two semicircular cylinder bodies, the sealing planes of the two sealing rings are dovetailed with each other, and the two sealing ribs which are arranged in the corresponding positions of the sealing bearing bushes are sealed to form a circle of sealing rings. The sealed protective sleeve for cable joints has the sealing structure, and therefore, reliable sealing is ensured when the sealed protective sleeve for cable joints is used.