The invention discloses a wireless intelligent bolt and an online monitoring system. A bolt main body, a force measuring rod component, a strain gauge, a temperature sensor, an integrated circuit board, a power supply device, a sealing cover, a local signal receiving and transmitting device and a terminal signal receiving and processing device are included. The non-threaded end portion of the boltmain body is processed with a built-in hole with a certain depth. A temperature sensor is arranged on the bottom surface of the built-in hole. The center of the bolt main body is provided with a center hole with a certain depth and a diameter. The bottom of the center hole is processed with an installation thread. One end of the force measuring rod component is fixed to the bottom of the center hole of the bolt main body through threaded connection, and the other end is in close contact with the bottom surface of the built-in hole of a bolt main body head. The deformation of the force measuring rod component is in direct proportion to the deformation of the bolt main body, and the deformation of the bolt main body can be accurately obtained through appropriate calculation. The wireless intelligent bolt and the online monitoring system have high precision, are easy to realize, and have good heat resistance performance and a wide application range.