The invention discloses a bed monitoring method based on an infrared sensor. The bed monitoring method comprises the following steps that 1, human body radiation information on a bed is collected in real time within set time through the infrared sensor; 2, a receiving terminal transmits the human body radiation information to a server; 3, the infrared sensor is controlled to sleep if the time of receiving the human body radiation information in the set time is greater than a preset time value, and the infrared sensor is controlled to work when the time of not receiving the human body radiationinformation is greater than a set threshold value; 4, when the receiving terminal receives the human body radiation information, the weight information of the bed is collected in real time through aweight sensor; if the server does not receive the human body radiation information within the set time period, alarm information is sent to an upper computer held by the dormitory management personnel; 5, the receiving terminal transmits the weight information to the server, and when the difference value between the current weight average value and the previous weight average value does not exceeda preset value, it is judged that the bed is for a corresponding student.