The utility model discloses a circuit system for measuring and controlling a steel structure property based on a piezoelectric primary element rod. Output signals of a sensor are collected by a silicon controlled control circuit, and a collecting process is controlled by an AD (analog to digital) front end path controller connecting with the silicon controlled control circuit. The silicon controlled control circuit is connected with an AD card of a computer, the AD card of the computer is connected with a boost converter, and the computer is connected with a single chip microcomputer encoding control circuit to process the signals. The boost converter is connected with the silicon controlled control circuit connecting with a control motor, and the silicon controlled control circuit is connected with a DA (digital to analog) back end path controller to control a signal output. The circuit system can combine the construction detection and the control technique of the steel structure, a forward voltage or a backward voltage can be exerted to control according to requirements, an on-line monitor and a real-time monitor can be effectively conducted, therefore the circuit system has a practical applicability.