The invention relates to a double-orientation lifting tackle with a locking device and a lifting method, and belongs to the technical field of overhead transmission line lifting tackle devices. According to the technical scheme, a hook (1) is fixed to a hook base (13), the two ends of the hook base are respectively connected with a guard plate, a sliding door (5) is arranged on the guard plate on one side and connected with a sliding door shaft (6), a sliding door hole (4) is formed in the middle of the sliding door and is triangular, a sliding door lock (3) penetrates into the sliding door hole (4), a locking clamp (21) is fixed to the guard plate on the other side, the two sides of the locking clamp are provided with a front locking clamp adjusting bolt (7) and a back locking clamp adjusting bolt (15) respectively, a pulley (9) is fixed to the portion between the two guard plates through a center cotter pin (11), and a front gear plate (17) and a back gear plate (18) are fixed to the two sides of the pulley (9) respectively. The double-orientation lifting tackle has the advantages that heavy objects are prevented from sliding downwards, labor intensity of workers is relieved, and the double-orientation lifting tackle is simple in structure and convenient to use.