WFBG sensing optical cable is a high-precision ultra-weak fiber grating array sensing cable. This cable features an in-built, skin-free, engraved ultra-weak fiber grating array, with tens of thousands of grating sensors with reflectivity ranging from 0.01% to 1% multiplexed on a single fiber. After undergoing special prestressed encapsulation and metal armor, it is cabled. The grating specifications and grating spacing can be customized according to user needs. The entire array requires no skinning or serial welding. It not only inherits the inherent advantages of traditional grating sensors but also boasts advantages such as long distance, high precision, and good real-time performance. With a high cost-performance ratio, it can replace traditional BOTDR strain monitoring technology. This strain optical cable possesses high mechanical strength and tensile resistance, is easy to deploy in engineering, and is suitable for various field temperature, strain, and vibration monitoring scenarios.