The loader crane load indicator provides the crane operator with effective job information, allowing the crane to be used effectively within its design parameters. With the help of a variety of signal sensors, the force limiter can provide the operator with information on the boom length, boom angle, working height, working range, rated lifting capacity and actual lifting capacity in real time. When the operation of the crane exceeds the allowable safety range, the force limiter will issue an audible and visual alarm to remind the operator to stop the illegal operation, and at the same time issue a control signal to automatically lock the movement in the dangerous direction.