An irregular heartbeat detecting device combining exercise intensity analysis and the detecting method thereof includes a measuring module, a storage module connected to the measuring module, and a processing module respectively connecting the measuring module and the storage module. The measuring module measures a heartbeat signal and physiological information of a user, calculates exercise intensity relative to the heartbeat signal and transfers into deliverable format for the processing module to read. Meanwhile, the processing module loads a proper sample of heartbeat signal from the storage module based on the physiological information and compares the heartbeat signal to the sample to obtain a correlation coefficient. The correlation coefficient is then compared to a preset range in order to determine whether the heartbeat is irregular, thereby increasing the accuracy of detection effectively, allowing the user to know the exercise intensity when the irregular heartbeat occurs to further understand his limitation of bearable exercise intensity, and reducing the risk of sudden death when the user does exercise exceeding the bearable exercise intensity.本發明結合運動強度分析之異常心跳偵測裝置及其方法，其包含有量測模組，連接該量測模組之儲存模組，以及分別連接該量測模組與該儲存模組之處理模組；其中，該量測模組量測使用者的心跳訊號及生理資訊，並計算出該心跳訊號所對應的運動強度，接著轉換為可輸出之格式由該處理模組讀取，同時該處理模組依據該生理資訊由該儲存模組內讀取一適合的心跳訊號樣本，藉由比對該待測心跳訊號與該心跳訊號樣本以得到一相關係數，再將該相關係數與預先設定之預設範圍值進行比對，藉以判斷該心跳訊號是否異常，不僅有效提升檢測的準確性，同時得以讓使用者了解異常心跳發生時的運動強度，進而了解自身運動強度限制，以及降低使用者從事超出自身所能承受之運動強度的運動而猝死的風險。
