The invention relates to an oscilloscope with a rotatable display screen, which includes a data acquisition unit, a drawing processing unit, a central processing unit and a touch display unit, wherein the data acquisition unit is for external signal input, and the input signal Processing a set of digital waveform data, the drawing processing unit is connected with the central processing unit and the data acquisition unit, and has a waveform processing unit, the waveform processing unit is controlled by the central processing unit to enable a first coordinate waveform processing module and one of the second coordinate waveform processing modules, which process the digital waveform data into the waveform display interface corresponding to the first or second coordinate, and then display it on the touch display unit; in this way, the waveform display interface switches coordinates again to perform When rotating, it can be achieved by switching the first and second coordinate waveform processing modules through the hardware circuit, without the coordinate conversion operation of the software, and the update rate is improved.