Measurement while drilling (MWD) ultrasonic data transmitting method and device

The invention provides a measurement while drilling (MWD) ultrasonic data transmitting method and device. a data transmitting pup joint is arranged at the lower end of a square drill rod and is used for respectively collecting four kinds of well drilling data, namely bit pressure, torsion, tension force and temperature, of an underground drill column and loading the four kinds of data to ultrasonic signals of 30+/-2.5kHz to be transmitted intermittently, and a transmission carrier for the ultrasonic signals is the drill column. A data receiving pup joint is arranged on the upper end of the square drill rod and is used for receiving the ultrasonic signals transmitted by the data transmitting pup joint, demodulating the received signals and transmitting the demodulated to a control chamber through a radio frequency antenna for display and storage at one hand, and is also used for giving out an order, indicating the type of the well drilling data to be uploaded in a next period, to the data transmitting pup joint at the other hand. The method and device disclosed by the invention have the advantages of strong antijamming capability, stable data, simple process, low cost, freedom of cable transmission and mud circulation and the like, so that the defects of a low-frequency sonic data transmitting method is made up, and the method and device are suitable for wireless transmission of the well drilling data in an oil and natural gas oil drilling process.