The utility model discloses a large-corner single-loop door-shaped drilling tower for cross spanning. The device comprises a middle cross arm, side cross arms are symmetrically connected to the two ends of the middle cross arm respectively, ground wire frames inclining outwards are symmetrically connected to the upper planes of the two ends of the middle cross arm respectively, the tail ends of the ground wire frames are bent inwards and provided with ground wire hanging points, and stand columns are symmetrically connected to the lower planes of the two ends of the middle cross arm respectively; a middle-phase wire hanging point is arranged on the lower plane of the middle portion of the middle cross arm, side-phase wire hanging points are arranged at the top ends of the side cross arms,and first jumper wire hanging points are arranged in the side-phase wire hanging points. The whole drilling tower is of a door-shaped structure. Compared with a traditional cup-shaped or dry-shaped iron tower. The structure form is simple, the height of the iron tower is low, meanwhile, the three-phase wires of the drilling tower are arranged on the same horizontal plane, a ground wire is not erected on the drilling tower, the height of the drilling tower is further reduced, power failure operation does not need to be conducted on an existing line during construction, the advantages of being rapid in construction and wide in application range are achieved, and obvious economic benefits are achieved.