The present invention relates to a constant temperature device for a rock bath, which mainly includes a bed body, bed heating elements, energy part, cover cabin, cover cabin opening and closing components, constant temperature control device, constant temperature temperature adjustment device, which are used to pass through the bed body when in use. The constant temperature temperature adjustment device sets the temperature value of the constant temperature. After that, the user lies on the energy part of the bed, and starts the heating of the bed body to heat, so that the heating starts from the constant temperature and reaches the use temperature. The cover compartment opening and closing assembly on the body closes the cover compartment provided above the bed body, so that when the user finishes using it, the constant temperature control device slows down the heating efficiency of the bed body heating element to generate a constant temperature, and the temperature of the constant temperature temperature The value is lower than the use temperature. In this way, when the next user wants to use it, the bed heating element does not need to start heating from the starting temperature of the environment. It only needs to heat from the preset constant temperature as the initial value. Reducing a lot of heating time and a lot of electricity costs is extremely efficient.本新型為有關一種岩盤浴之恆溫裝置，主要包括床體、床體加熱件、能量部、遮蓋艙、遮蓋艙啟閉組件、恆溫控制裝置、恆溫溫度調整裝置，其使用時係透過床體上的恆溫溫度調整裝置進行恆溫溫度的溫度值設定，爾後使用者躺臥於床體的能量部上，且啟動床體加熱件進行加熱，以從恆溫溫度開始加熱到達使用溫度，並利用設於床體上的遮蓋艙啟閉組件將設於床體上方的遮蓋艙進行關閉，以當使用者結束使用後，恆溫控制裝置將床體加熱件減緩加熱效率以產生一恆溫溫度，且恆溫溫度之溫度值乃低於使用溫度，如此，當下一位使用者欲使用時，床體加熱件無須從環境的起始溫度開始加熱，只須從預設的恆溫溫度作為初始值加熱即可，由此可減少大量的加熱時間以及大量的電費，乃具有極高的效益。
