An intelligent space safety monitoring system, comprising: a management server for storing and outputting data; a state sensing unit, disposed in an arbitrary sensing space, being configured for sensing a normal state or an abnormal state within the sensing space and transmitting a sensing value to the management server; a sensing space photographing unit configured for transmitting to the management server a first screen obtained by photographing the sensing space in the normal state in which the sensing value sensed by the state sensing unit is smaller than a setting value and a second screen obtained by photographing the sensing space in the abnormal state in which the sensing value sensed by the state sensing unit is equal to or bigger than the setting value; and an abnormal state determining unit configured for, by comparing the first screen and the second screen, determining the sensing space as in a risk state when the sensing value transmitted from the state sensing unit is equal to or bigger than the setting value, and transmitting the risk state to a user, wherein the abnormal state determining unit is configured to classify the risk state of the sensing space by a risk state rating based on how the sensing space is used and to store it in the management server, and wherein the abnormal state determining unit is further configured to transmit the risk state rating of the sensing space and environmental factor information of the sensing space sensed by the state sensing unit to the user when the sensing value transmitted from the state sensing unit is smaller than the setting value, wherein the setting value is set differently based on how the sensing space is used, and wherein the first screen is an image that the sensing space photographing unit has obtained by photographing the sensing space when the user is not present in the sensing space or when the sensing space is not using power or during a time span separately set by the user during which the user is not present in the sensing space. a management server for storing and outputting data; a state sensing unit, disposed in an arbitrary sensing space, being configured for sensing a normal state or an abnormal state within the sensing space and transmitting a sensing value to the management server; a sensing space photographing unit configured for transmitting to the management server a first screen obtained by photographing the sensing space in the normal state in which the sensing value sensed by the state sensing unit is smaller than a setting value and a second screen obtained by photographing the sensing space in the abnormal state in which the sensing value sensed by the state sensing unit is equal to or bigger than the setting value; and an abnormal state determining unit configured for, by comparing the first screen and the second screen, determining the sensing space as in a risk state when the sensing value transmitted from the state sensing unit is equal to or bigger than the setting value, and transmitting the risk state to a user, wherein the abnormal state determining unit is configured to classify the risk state of the sensing space by a risk state rating based on how the sensing space is used and to store it in the management server, and wherein the abnormal state determining unit is further configured to transmit the risk state rating of the sensing space and environmental factor information of the sensing space sensed by the state sensing unit to the user when the sensing value transmitted from the state sensing unit is smaller than the setting value, wherein the setting value is set differently based on how the sensing space is used, and wherein the first screen is an image that the sensing space photographing unit has obtained by photographing the sensing space when the user is not present in the sensing space or when the sensing space is not using power or during a time span separately set by the user during which the user is not present in the sensing space.