The embodiment of the invention provides a device, a
system and a method for repairing an
underground pipeline of a trenchless pneumatic
cracking pipe. The
system comprises an existing well and a working pit, wherein the existing well is provided with a
pulley group and a
winch; the
winch is connected with a
cracking pipe head through a traction device; the traction device is provided with front and back steering connectors, a pin, an adjusting device and a bolt; and the working pit is externally provided with an
air compressor to drive a
pipe tampering
machine. The
cracking pipe head is provided with a tapered head and a
tail part for connecting with a replacing pipe, and is provided with a through hole; the
middle line of the through hole is overlapped with the
middle line of the tapered head; a front columnar through hole is used for mounting the front steering connector; a
tail tapered through hole is used for connecting the pipe tampering
machine; the cracking pipe head is provided with the tapered head and an expansion cutter is arranged on the outer surface; and the outer
diameter of the cracking pipe head formed by the expansion cutter is greater than the inner pipe of a waste pipe to propel the expanded and cracked waste pipe. The whole process ingeniously utilizes the returning function of the pipe tampering
machine under the condition that one pit corresponds to one well, and a receiving pit is replaced by the existing well. Therefore, the digging amount can be reduced so that the working efficiency is improved and the cost is saved.