The mobile crane load moment limiter, also termed Crane Load Moment Indicator (LMI) or Crane Safe Load Indicator (SLI), is a core safety monitoring accessory for telescopic mobile cranes. It integrates high-precision angle sensors, length detectors and pressure sensors to synchronously monitor real-time lifting load, boom length, luffing angle and working radius. The intuitive onboard HMI displays all operational parameters in real time, helping operators keep all lifting operations within factory design safety parameters. Once the load moment exceeds the rated threshold, the system triggers instant audible and visual alarms and cuts off dangerous lifting movements automatically to prevent tipping and structural damage. Featuring shockproof and electromagnetic interference resistance, it fits truck cranes, rough terrain cranes and crawler cranes for port, construction and mining lifting scenarios.