The invention discloses a system and a method for detecting keyboard resistance based on ARM (Advanced RISC Machines), aiming to detect the contact resistance of the keyboard of the finished computer. The keyboard to be detected is connected with an array switch, the array switch is respectively connected with a constant flow source, a voltage comparator, an amplifier and an ARM chip; each row ofswitches of the array switch consists of a KI switch and a KV switch, the KI switch is connected with the constant flow source, the KV switch is respectively connected with the amplifier and the voltage comparator, the keyboard to be detected is scanned with constant flow through the array switch, the voltage comparator judges the output of the constant flow source; a four-line resistance testingmethod is used for detecting the voltage at two ends of a keystroke contacting a resistor, and a virtual keyboard is established by a software part. The invention improves the scanning speed of the keyboard and the processing speed of the test information, so that the keystroke breaking and the serial keystroke can be detected, and the quality of the keyboard and the manufacturing technique carelessness of the keyboard can be judged by detecting the contacting resistor of each keyboard; and the detected resistance precision reaches 0.5%. The invention has good expandability and commonality.