The invention discloses a portable universal digital storage oscilloscope. The passive probe connects with the signal transforming conditioning circuit, analog-digital conversion ADC circuit, data path and high frequency control module, DSP processor system, data interface, and the signal transforming conditioning circuit connects with the trigger function generating circuit, data path and high frequency control module, and ADC circuit, and digital signal LCD display connects with the DSP processor system, and the signal transforming conditioning circuit, and the rechargeable battery and AC-DC power module connect with the intelligent power switch and distribution circuit, and DSP processor system. The invention uses four ADC chips to phase interleaving sampling, which increasing bandwidth, and lower cost; the external power and internal battery can automatically switch to supply power, to intelligently control the power distribution, with low power, small size, and can be used in various testing field handheld; the single machine completes the signal processing result and displaying, audio recording and storing the output, which can set up and update procedures through data interface, and it is a portable universal digital storage oscilloscope.