The invention discloses a simple waveform signal generator, comprising an LCD display driving module, a matrix keyboard, a single-chip microcomputer, a frequency band selector circuit, a duty ratio adjusting circuit, a frequency fine-adjusting circuit, a function signal generator, and an operational amplifier circuit; the LCD display driving module is connected with the single-chip microcomputer,the matrix keyboard is connected with the single-chip microcomputer, the single-chip microcomputer is connected with the frequency band selector circuit, the frequency band selector circuit, the dutyratio adjusting circuit and the frequency fine-adjusting circuit are connected with the function signal generator, the function signal generator is connected with the operational amplifier circuit, and the function signal generator uses MAX038. With the combination of the LCD display driving module, the matrix keyboard, the single-chip microcomputer, the frequency band selector circuit, the duty ratio adjusting circuit, the frequency fine-adjusting circuit, the function signal generator and the operational amplifier circuit, the simple waveform signal generator has simplified structure and reduced cost and has a more flexible control mode.