An ultrasonic liquid level measuring instrument was designed by using wireless communication,taking STC89C52 as the core controller and ultrasonic ranging module as the liquid level measuring sensor.NRF24L01 wireless module was adopted for real time wireless transmission and receiving of the data.Then the received data was sent to the LCD display screen after real time processing.At the same time,the data was sent to the PC real time display by MAX232 level conversion through the serial port and data curve was drawn.Experimental results showed that the instrument could realize long distance wireless real time liquid level measurement,replaced the buoyancy and cable type liquid level measuring instrument of tradition.It had the characteristics of high precision and convenient data control.