The utility model relates to a beehive monitoring device, which is suitable for mounting in a beehive, and comprises a carbon dioxide sensing element, an alarm module and a monitoring module.The carbon dioxide sensor can detect the carbon dioxide content in the beehive to obtain a detection signal.The monitoring module can set the threshold value of the proportion of a bee returning to the nest, analyze the detection signal to get the proportion of a bee returning to the nest, and control the alarm module to send an alarm message representing that the bee has returned to the nest when judging that the proportion of the bee returning to the nest is greater than the threshold value of the proportion of the bee returning to the nest.The beekeeper can confirm whether the colony returns to the nest through the alarm message.一種蜂箱監測裝置，適用於安裝在一蜂箱，並包含一個二氧化碳感測元件、一警報模組，及一監控模組。該二氧化碳感測元件可偵測該蜂箱內的二氧化碳含量以得到一偵測訊號。該監控模組可供設定一回巢比例閥值，並可分析該偵測訊號以得到一蜜蜂回巢比例，且會於判斷該蜜蜂回巢比例大於該回巢比例閥值時，控制該警報模組發出一代表蜂群已回巢的警報訊息。養蜂者可透過該警報訊息確認蜂群是否回巢。
