The invention discloses a flexible clamp for an optical fiber sensor. The flexible clamp comprises a clamping rod and a clamping head connected with the clamping rod in a matched manner, wherein a connecting rod is arranged at one end of the clamping rod; a counter bore is formed at one end of the clamping head; the connecting rod of the clamping rod is connected with the counter bore of the clamping head in a matched manner; an elastic body is arranged at the bottom end of the counter bore of the clamping head; one end of the elastic body is matched with the bottom end of the counter bore ofthe clamping head; the other end of the elastic body is matched with the end part of the connecting rod of the clamping rod; a through hole which is used for allowing a sensitive end of the optical fiber sensor to pass through and is used for clamping light transmitting optical fibers of the optical fiber sensor is arranged in the clamping rod; a first micro through hole which is used for allowing the sensitive end of the optical fiber sensor to pass through and is used for clamping the sensitive end of the optical fiber sensor is arranged in the elastic body; a second micro through hole which is used for allowing a sensitive end of the optical fiber sensor to pass through is arranged in the clamping head; and, the axis of the through hole, the axis of the first micro through hole and theaxis of the second micro through hole are positioned in the same straight line. According to the flexible clamp disclosed by the invention, the flexible clamping for the optical fiber sensor can be realized and the damage to the optical fiber sensor is avoided; in addition, the flexible clamp is firm and stable and can be reused.