A patch having expansion and supporting effects, comprising a body (10, 10A, 10B), at least one first support member (20, 20A, 20B), and at least one second support member (30, 30A, 0B). The body (10, 10A, 10B) is provided with an adhesive surface (11, 11A) and a bonding surface (12, 12A, 12B); the two support members (20, 20A, 20B, 30, 30A, 30B) are provided on the body (10, 10A, 10B) and arranged to movably match each other; each support member (20, 20A, 20B, 30, 30A, 30B) is disposed in a length direction of the body (10, 10A, 10B) and provided with a fixing portion (21, 31, 21A, 31A, 21B, 31B), a snap-fit portion (22, 32, 22A, 32A), and a movable portion (23, 33, 23A, 33A, 23B, 33B), so that the two support members (20, 20A, 20B, 30, 30A, 30B) are disposed in the length direction of the body (10, 10A, 10B) and arranged linearly; the snap-fit portion (22, 32, 22A, 32A) of each support member (20, 20A, 20B, 30, 30A, 30B) is capable of being snap-fitted to the movable portion (23, 33, 23A, 33A, 23B, 33B) of the other support member (20, 20A, 20B, 30, 30A, 30B), and then a support strength required by the body (10, 10A, 10B) during an expansion process is provided by means of a structural pattern in which the snap-fit portion (22, 32, 22A, 32A) is snap-fitted to the movable portion (23, 33, 23A, 33A, 23B, 33B). Therefore, a patch that is simple in structure and convenient to use and has expansion and supporting effects is provided.