Rotary blade self-updating intelligent drill bit and updating method

The rotary blade self-updating intelligent drill bit comprises a drill bit body, rotary blades, PDC teeth, a nozzle and a connector, the rotary blades are arranged on the drill bit body and can rotate around a rotary shaft, and a test system, a signal input device, a microcomputer, a signal output device, a battery and a motor are arranged in the drill bit body; the testing system can measure rock lithology, rock compressive strength, PDC tooth abrasion conditions and acceleration values of a drill bit in three directions, and the signal input device can transmit measured parameters and testing data of the logging-while-drilling instrument to the microcomputer in a signal mode. The microcomputer transmits an output signal to the motor through the signal output device after comparison and calculation through a database, and the motor drives the blades to rotate, so that underground self-updating of the cutting structure of the drill bit is realized, the tripping time is saved, the drilling cost is reduced, and