The invention provides a control method of automatic setting of a digital oscilloscope. A hardware processor such as FPGA is used for simultaneously and continuously comparing input signals of all thechannels and adjusting a vertical gear to obtain amplitude information of the input signals; peak values of input signal peaks can be accurately obtained when the number of sampling points or sampling time required by setting is achieved, so that the amplitude measuring efficiency can be improved; meanwhile, the number of the sampling points at least reaches a cycle of the input signals, so thatthe misjudgment of the amplitude is avoided; sampling data is subjected to fast Fourier transform when measuring the frequency to obtain a position with a maximum value of spectrum component; the signal frequency f0 is calculated according to the number of the sampling points, the sampling frequency and the position with the maximum value, so that the measurement of amplitude of the input signalsand the measurement of the frequency are completely separated and are carried out in parallel; the measurement errors caused by mutual influence are avoided; the purposes of achieving fast automatic setting speed and achieving excellent display effect after finishing setting are achieved.