The invention relates to a respiration monitoring device capable of recognizing a respiration state. The respiration monitoring device is divided into a daytime monitoring module and a night monitoring module, and is more suitable for actual medical application; and during daytime patient activities, the patient can wear the daytime monitoring module, which does not influence the activities, and the device is multiple in monitoring items and high in detection accuracy; when the night module is used at night, on one hand, respiration of a patient can be monitored, on the other hand, the monitoring device is simple in structure and light, sleep is not affected, the monitoring and alarming functions are achieved, and an alarm can be given in time no matter under the conditions of dyspnea, transient respiratory arrest and the like. A unique daytime detection module is designed, multiple indexes of respiration can be detected by only using one light detection means, the monitoring effect isgood, and the cost is low; and the night monitoring module uses a capacitance detection method, the detection principle is simple, the detection effect is good, the cost is low, and even disposable use can be realized.