With its high duty cycle, wide field of view and high detection sensitivity, Water Chereknov Detector Array as one of sub-arrays of Large High Altitude Air Shower Observatory is a promising facility to monitor transient phenomena in the very high energy gamma-ray band. In this work, a real-time monitor for selected TeV extragalactic sources is introduced, this flare monitor is developed to detect very high energy flare events and for further studying the power-providing mechanism of blazar relativistic jets. The detailed information such as the searching method and sensitivity of this real-time flare monitor is also presented. In the end, successful multi-wavelength and multi-messenger observation of 1ES 1959+650 and IC 310 also confirms the capabilities and reliability of the monitoring system.

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