The invention relates to a method and a device for monitoring and alarming a patient, comprising the following steps: creating a personal database of the patient at a cloud end, and inputting relevantcaretaker information; setting a physical sign threshold range in the personal database; using sensors to collect the patient's physical sign data, uploading the physical sign data to the personal database; judging whether the patient is normal according to the threshold range of the physical sign; if no, alarming the relevant caregiver. The invention can provide patients with dynamic real-time continuous data statistics and effective early warning, and can provide technical support for disease tracking after treatment. The invention integrates the sensor internet of things technology and thecloud computing technology, and improves the interaction rate and the concurrency rate of the collected data and the software system. The invention can timely warn the abnormal condition of the bed-ridden user, maximally improve the comfort degree of the bed-ridden patient and reduce the death rate caused by the sudden disease of the bed-ridden elderly.