The invention discloses a signal processing and displaying system. The signal processing and displaying system comprises a button, a single chip microcomputer, a display, an interface circuit, a digital-to-analog conversion module and an operational amplifier, wherein the button and the display are connected with the single chip microcomputer; the single chip microcomputer, the interface circuit,the digital-to-analog conversion module and the operational amplifier are connected in sequence; the single chip microcomputer is an AT89S52 single chip microcomputer; the single chip microcomputer isused for generating a signal; the button is used for inputting a signal to the single chip microcomputer; the display is applied to display output of the single chip microcomputer; the interface circuit is used for outputting a signal of the single chip microcomputer; the digital-to-analog conversion module is used for converting a digital signal to an analog signal; the operational amplifier isused for amplifying the signal, and outputting the signal to periphery equipment. By adopting the signal processing and displaying system, a special chip is replaced by the single chip microcomputer,so that the cost is lowered; meanwhile, the control difficulty is lowered, so that the flexibility of the control manner of signal processing is enhanced.