Numerical control machine tool vibration measuring method

The invention relates to a numerical control machine tool vibration measuring method. According to the method, the average vibration quantity value and upper-limit vibration quantity value of the vibration source of a machine tool in operation are obtained through tests; the average vibration quantity value and the upper-limit vibration quantity value are written into the measurement and calculation program of a programmable controller; a vibration sensor inputs the measured vibration quantity value of the numerical control machine tool into the programmable controller through a shielding cable; the vibration measurement calculation program of the programmable controller carries out calculation processing; when the measured vibration quantity value is smaller than the average vibration quantity value, the programmable controller does not act; when the measured vibration quantity value is larger than the average vibration quantity value and is smaller than the upper-limit vibration quantity value, the programm