Concrete built-in anti-leakage special casing pipe

The utility model relates to a concrete pre-burying anti-leakage special sleeve pipe which mainly solves the problem that no concrete pre-burying sleeve pipe having the advantages of high durability and effective leakage prevention exists at present. One or more than one water stopping wing ring bulged out of a pipe wall is fixedly arranged on the outer wall of the hollow sleeve pipe; the inner diameter of the sleeve pipe is larger than the outer diameter of a pipeline which is matched and sheathed with the sleeve pipe; the gap between the sleeve pipe and the sheathed pipeline can be filled with elastic water-proof sealing materials. A groove of which the inner diameter is larger than the lower part of the sleeve pipe is arranged at the upper part of the sleeve pipe; a length regulating pipe of which the upper part extends out of the groove is sheathed in the groove in a matching way. The sleeve pipe can be made of plastics; because the diameter of the groove is larger than the inner diameter of the sleeve pipe and can be matched with the pipe diameter of a water discharging pipe conforming to the national standard, the sleeve pipe can be freely lengthened as required by inserting the regulating pipe with the definite length into the groove. Because arranged on the outer circumference of the sleeve pipe, the water stopping ring can effectively perform the anti-leakage function. The utility model is mainly used for a preinstalled pipe installation through hole before pipelines are installed in a concrete slab.