The utility model relates to a U-shaped lock (2) for bicycle and a lock seat (3) arranged on the bicycle. The U-shaped lock (2) is provided with a lock ring (4) which can be completely separated from a lock body (7). The U-shaped lock (2) has reliable picking-proof function. The lock body (7) can be made to a steel pipe fitting. A lock mechanism (8) is arranged in the lock body, a lock groove (6) on the end part (5) of the lock ring is fastened by a clamping claw (10), and thus the lock mechanism (8) is locked. The U-shaped lock (2) provided by the utility model can be stored in the lock seat (3). The lock seat (3) is bound on the bicycle frame by a clamping belt (13). The lock seat (3) is provided with a seat sleeve (19) and a seat sleeve (22), one is used to receive the lock body (7), and the other is used to receive the lock ring (4). The U-shaped lock (2) can be safely placed in the lock seat (3) when the U-shaped lock (2) is not used.
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