A physiological status monitoring device (10, 10'), comprising: a monitoring module, comprising: a first housing configured to be arranged at a first side of a flexible object; a monitoring unit arranged in the first housing for monitoring a physiological status of a human body; a first processing unit electrically connected to the monitoring unit for controlling operations of the monitoring unit; and a first magnetic fixing unit connected to the first housing; and a fixing module, comprising: a second housing configured to be arranged at a second side of the flexible object; and a second magnetic fixing unit connected to the second housing; wherein the first magnetic fixing unit and the second magnetic fixing unit are configured to hold the first housing and the second housing on the flexible object by magnetic force; characterized in that: one of the first housing and the second housing has a recessed structure, the other one of the first housing and the second housing has a protrusion structure corresponding to the recessed structure, the protrusion structure and the recessed structure being arranged between the first magnetic fixing unit and the second magnetic fixing unit and configured to be engaged with each other for clamping the flexible object. a monitoring module, comprising: a first housing configured to be arranged at a first side of a flexible object; a monitoring unit arranged in the first housing for monitoring a physiological status of a human body; a first processing unit electrically connected to the monitoring unit for controlling operations of the monitoring unit; and a first magnetic fixing unit connected to the first housing; and a first housing configured to be arranged at a first side of a flexible object; a monitoring unit arranged in the first housing for monitoring a physiological status of a human body; a first processing unit electrically connected to the monitoring unit for controlling operations of the monitoring unit; and a first magnetic fixing unit connected to the first housing; and a fixing module, comprising: a second housing configured to be arranged at a second side of the flexible object; and a second magnetic fixing unit connected to the second housing; a second housing configured to be arranged at a second side of the flexible object; and a second magnetic fixing unit connected to the second housing; wherein the first magnetic fixing unit and the second magnetic fixing unit are configured to hold the first housing and the second housing on the flexible object by magnetic force; characterized in that: one of the first housing and the second housing has a recessed structure, the other one of the first housing and the second housing has a protrusion structure corresponding to the recessed structure, the protrusion structure and the recessed structure being arranged between the first magnetic fixing unit and the second magnetic fixing unit and configured to be engaged with each other for clamping the flexible object. one of the first housing and the second housing has a recessed structure, the other one of the first housing and the second housing has a protrusion structure corresponding to the recessed structure, the protrusion structure and the recessed structure being arranged between the first magnetic fixing unit and the second magnetic fixing unit and configured to be engaged with each other for clamping the flexible object.