Hydraulic pile driving and extracting device of highway anti-collision guardrail

The invention discloses a hydraulic pile driving and extracting device of a highway anti-collision guardrail. The device comprises an opening box body (1), an up-down floating guide part (2), a pile driving part (3) and a pile extracting part (4); the pile extracting part includes a pile extracting hydraulic oil cylinder (41), a clamping hydraulic cylinder (42), a locking chuck (43) and an inner diameter expansion mechanism (44); the inner diameter expansion mechanism includes an expansion hydraulic cylinder (441), an expansion head (442) and a clamping sleeve (443); the expansion head is mounted on an extension end of the expansion hydraulic cylinder (441), and includes a translation guide ring (4421), a clamping jaw (4422) and a connecting head (4423); and big end down conical surface structures are arranged on the inner surface of the clamping jaw and the outer surface of the connecting head. The hydraulic pile driving and extracting device can effectively extract out broken piles above or below pavements without needing excavation when realizing a pile driving function, and in particular, is suitable for the repair and maintenance work of stand columns of the highway anti-collision guardrail.