To provide a forming method for a pipe burying ditch, which can prevent earth from dropping into a previously formed, in dividing and forming the pipe burying ditch in a plurality of times or in forming a new pipe burying ditch to cross with the previously formed pipe burying ditch, and a continuous ditch forming jig and a crossing ditch forming jig.

A new pipe burying ditch is formed with a ditch forming tool, with the continuous ditch forming jig set so as to cover above the end part of the covered conduit pipe buried in the previously formed pipe burying ditch, while the lower end of the ditch forming tool is made to pass above the tilting plate and pulled out of the ground at the end terminal of the new pipe burying ditch, and then the continuous ditch forming jig is taken from within the ditch to allow both the pipe burying ditches to be continued with each other. The new pipe burying ditch is formed with the ditch forming tool, with a cross ditch forming tool set to the previously formed pipe burying ditch, and the new pipe burying ditch is formed crossing with the previously formed pipe burying ditch, and then the cross ditch forming jig is taken out from within the ditch to allow both the pipe burying ditches to orthogonally cross with each other.