The utility model relates to a cable pit laid on the power transmission sequence framework, especially a concave type assembled cable pit of power transmission sequence, its structural feature lie in,the cable pit is connected to form according to the preface by plural number festival ditch body head and the tail, every section transversal concave type structure of personally submitting that theditch was personally experienced sth. Part of the body, including bottom plate and both sides board, the medial surface of both sides board is pre -buried to have a plurality of cell type cable support built -in fittings, cell type cable support built -in fitting perpendicular to bottom plate distributes, the preceding terminal surface of every section ditch body is provided with the tenon, and the rear end face then be the mortise, the mortise joggle of tenon and preceding a lesson ditch body rear end face, the mortise then with back a lesson ditch body before the tenon joggle of terminal surface, form end to end's structure, the gap middling pressure that the joggle was located is equipped with the water -swelling rubber strip, every section ditch body is in the joggle with preceding, deutomerite ditch body coupling and adopts a plurality of single -end bolts to carry out fixed connection. The advantage lies in: reduce the construction work volume, shorten construction period, improve the efficiency of long -distance transport, reduce construction cost, enlarged the scope that the assembled cable pit was used in power transmission transmission line engineering.