The utility model provides an arm structure and a bionic
robot, and relates to the technical field of humanoid robots. The arm structure comprises a driving part, an upper arm part, a front arm part and a palm part, the upper arm part is rotationally connected with the driving part, the front arm part is rotationally connected with the end, away from the driving part, of the upper arm part, the palm part is rotationally connected with the end, away from the front arm part, of the upper arm part, the driving part is provided with a first limiting part, and the driving part is provided with a second limiting part. The arm structure comprises an upper arm part and a front arm part, the upper arm part is provided with a second limiting part, the front arm part is provided with a third limiting part, the first limiting part is used for limiting the rotating operation angle of the arm structure, the second limiting part is used for limiting the rotating operation angle of the upper arm part, and the third limiting part is used for limiting the rotating operation angle of the front arm part. The rotation operation angles of the upper arm part, the front arm part and the palm part can be limited, the maximum movement range of
human body parts is simulated, and the anthropomorphic effect of the arms is further improved.