Disclosed is a postoperative functional exerciser for frozen shoulder. The exerciser includes a hand push rod (1) and a restrictive band (2) for restricting the elbow. The hand push rod (1) comprises a wristband (11) and a push rod (12). One end of the push rod (12) is connected with the wristband (11). When the hand push rod (1) and the restrictive band (2) are in operation, a part of the restrictive band (2) winds around the elbow joint of an affected arm, the other part winds around a waist buckle (3) at a waist portion of the restrictive band (2) on a side opposite to the affected arm, and the wristband (11) is sleeved on the wrist of the affected arm. The upper arm is tied to the body by means of the restrictive band (2).