The invention discloses a high-safety truck crane main arm. The high-safety truck crane main arm comprises a main arm body, a probe and a control module, the probe is inserted into the main arm body in a sliding mode, the probe is connected with the control module through a wire, the probe comprises a guide pipe and a plurality of cameras, the cameras are fixedly connected with the top and the two sides of the guide pipe respectively, the control module comprises a main shell and a display screen, the display screen is fixedly connected with the outer wall of the main shell, a controller, a memory, a power supply, a signal receiver and a signal transmitter are arranged in the main shell, a mounting opening is formed in the side, away from the display screen, of the main shell, and a baffle is rotationally connected into the mounting opening through a rotating shaft. Through the arrangement of a probe monitoring mechanism, the situation of a steel wire rope in the truck crane main arm can be monitored in real time, and therefore the using safety of the truck crane main arm is effectively guaranteed.