The invention discloses an under-shaft fracture data wireless transmission device. The under-shaft fracture data wireless transmission device comprises command labels, a ground information ball data reading device, a label putting device, an information ball capturing device, a motor control and dropping short joint, a main control communication short joint, a data collection short joint and a battery pack, the label putting device and the information ball capturing device are installed at a wellhead, and the motor control and dropping short joint, the main control communication short joint, the data collection short joint and the battery pack are installed on a coiled tubing; the label putting device is used for putting the command labels into a sleeve; the motor control and dropping short joint achieves storage of information ball data in a ball bin through a mutual inductance power output unit and a wireless communication unit, when the device is full of data, a motor drives the ball bin to carry out translation motion, and then information balls enter an annulus, and are exhausted to the ground; the data collection short joint is used for collecting underground pressure and temperature data; the main control short joint is used for receiving commands of the command labels, and controlling work of the mutual inductance power output unit, the wireless communication unit and the motor according to the commands of the command labels. By means of the under-shaft fracture data wireless transmission device, wireless transmission of under-shaft data can be achieved, and labor and material resources are saved on the condition that the fracture result is accurately monitored in real time.