The utility model relates to a prefabricated reinforcing bar grout connecting sleeve of assembling, the shape is the hollow circular cylinder, is equipped with the shear key on the sleeve inner wall, and it has two to reserve the drill way to open on the lateral wall, and one is the grout mouth promptly, and another is the grout outlet, still is equipped with the spacing key tooth of reinforcing bar in the sleeve, and this connecting sleeve is made by the compound plastics processing of fiber reinforcement. Compared with the prior art, the utility model discloses a fiber reinforcement compound plastics processing make, under the condition of having guaranteed the requirement of steel bar connection mechanics, is showing and lighten the dead weight to the durability has been strengthened.