Provided is a blood parameter monitoring device, including: a skin patch wearable on skin; a blood parameter sensor arranged at the skin patch and configured to detect a blood parameter; a processor configured to send an abnormality indication signal when determining that the blood parameter is not within a predetermined range, and send a normality indication signal when determining that the blood parameter is within the predetermined range; a timer configured to start a timing process upon receiving the abnormality indication signal, stop the timing process upon receiving the normality indication signal, and send an alarm signal if a duration of the timing process is longer than or equal to a predetermined duration; and an alarm connected to the timer and configured to give an alarm and/or trigger a predetermined mobile communication terminal to send a warning signal to a preset phone number, after receiving the alarm signal.