The utility model discloses a back of body bow formula structure for embracing pole relates to transmission line construction professional equipment technical field to the anti -bending strength of pole is embraced in the enhancement, reduces transmission line tower assembling construction's safe risk. This back of the body bow formula structure is including articulating at the support frame of embracing the pole body of rod, and the end hinge that stretches out of support frame has connect the drag link mechanism, the drag link mechanism includes that one end and support frame stretch out the end hinge and connect, the other end and armful first pull rod of peak of the staff portion articulated to and one end and support frame stretch out the end hinge and connect, and the other end passes through adjusting device and embraces a pole bottom articulated second pull rod, wherein, adjusting device is used for adjusting the support frame and stretches out end a to distance of embracing the pole bottom. The utility model provides a back of the body bow formula structure is used for pretension armful pole before an armful pole lifts by crane.