In present-day, the use of digital medical monitors could provide the accurate number reading and the ability of data recording than the use of analogy monitors. However, the individual medical monitor usually records and shows information by itself generally. The establishing of connections between digital medical monitors and computers could be complicated and expensive. The complexity and high-cost block the ability of medical information collecting by computer. In order to solve this problem, a low-cost universal reader for LED displays of medical monitors is proposed in this paper. This universal reader is based on a camera which could be used to recognize digital numbers. The use of general camera could leads to the features of low-cost and universality. Moreover, the information of various medical monitors could be collected with the use of a universal reader at the same time, and then be recorded by computers for future analyses.