Non-excavation repairing device and method for buried water supply pipeline

The invention provides a non-excavation repairing device and method for an underground water supply pipeline, and the repairing device comprises a lining pipe reel which is used for winding and transporting a lining pipe with the section extruded to be I-shaped; the steam generator is used for heating and softening the lining pipe of which the section is extruded to be I-shaped; the air bag is used for rounding the softened lining pipe of which the section is extruded to be I-shaped so as to form the lining pipe of which the end surface is round; the hot melting welding device is used for welding and connecting the two sections of lining pipes with the circular end surfaces; the compression roller device is used for extruding the softened lining pipe with the circular end face to form the lining pipe with the I-shaped section; the repairing step comprises the step of welding and lengthening the lining pipe of which the section is extruded to be I-shaped until the pulled lining pipe reaches the repairing lengt