The invention discloses a biopsy needle and a biopsy device comprising the biopsy needle and a driving device. The biopsy needle is used for being connected with a driving device and can be driven by the driving device to be switched to a differential rotating state or a constant-speed rotating state. The biopsy needle comprises an outer knife tube and an inner knife tube arranged in the outer knife tube in a sliding mode. In a differential rotation state, the inner knife tube rotates and translates relative to the outer knife tube. In the constant-speed rotating state, the inner knife tube only rotates relative to the outer knife tube. The driving device of the biopsy device can move to different positions to output power to the biopsy needle, and gear shifting operation is achieved, so that the biopsy needle is switched to different working states according to needs. In a differential rotation state, living tissues can be cut; In the constant-speed rotating state, the inner knife tube only rotates relative to the outer knife tube, a medicine can be injected through the inner knife tube and evenly diffused to the whole incision of living tissue, pain of a patient is relieved in time, hematoma can be circumferentially sucked and removed through the inner knife tube, and the inner knife tube cannot be blocked.