Drill bit for pre-embedded drilling of telegraph pole

The invention discloses a drill bit for pre-buried drilling of a telegraph pole, belongs to the technical field of drilling drill bits, and aims to solve the problems of low drilling precision, soil accumulation and the like at present. The drill bit comprises a drill bit body, the outer sides of two spiral bodies close to the bottom end of a rotary excavating rotating shaft are fixedly sleeved with two positioning rings, and the top of the rotary excavating rotating shaft is connected with two first arc-shaped plates extending in the radial direction; the drill bit further comprises two side expanding rotary excavating pieces rotationally assembled between the two positioning rings and a barrel frame arranged on the outer sides of the two spiral bodies between the positioning ring above and the first arc-shaped plate in a sleeving mode, and a locking piece for controlling the relative deflection angle between the barrel frame and the drill bit body is assembled at the top of the barrel frame. The barrel fram