The invention relates to a sensor sheath clamp applied to a mooring chain of an offshore drilling platform. The sensor sheath clamp comprises the following parts: a beam; a two-way screw, mounted on the beam along the length direction of the beam; a left locking hook and a right locking hook, which are respectively screwed on the two-way screw, wherein the two-way screw is rotated to enable the left locking hook and the right locking hook to synchronously get close or leave so as to clamp or loosen the mooring chain link; and a left positioning block and a right positioning block, which are symmetrically mounted on the outer side of the beam, wherein the left and right positioning blocks are each provided with a cylindrical notch for holding the sensor sheath. The sensor clamp provided bythe invention is compact in structure and convenient to use, meets the requirements of installation and replacement of the mooring chain state detecting sensor, meanwhile has a good fixing effect on the sensor, and ensures the measurement precision and stability of the sensor.