The invention relates to a mechanical state monitoring system for a post porcelain insulator. The mechanical state monitoring system is characterized by comprising a wireless resistance strain sensor(2) mounted between two umbrella skirts on a post porcelain insulator vertical column (1), the wireless resistance strain sensor (2) is connected with a wireless sensor signal receiver (3) in a wireless mode, and the wireless sensor signal receiver (3) is connected with a background terminal (6) through a data acquisition card (4). By the aid of the mechanical state monitoring system for the postporcelain insulator, the post porcelain insulator can be monitored on line, the mechanical state of the post porcelain insulator is analyzed, and safety operation of power equipment is effectively guaranteed.