The invention particularly discloses a valve sealing device of a hot pool. The valve sealing device comprises the hot pool. A steam pipe is arranged on the side wall of the hot pool and provided with a temperature control device, and the temperature control device is located on the outer portion of the hot pool. The temperature control device comprises a control module, a steam control valve and a pneumatic actuator used for controlling a valve rod of the steam control valve. The control module is electrically connected with the pneumatic actuator. A temperature sensor is arranged in the hot pool and electrically connected with the control module. The temperature control device further comprises a steam sealing sleeve for completely sealing the pneumatic actuator and the steam control valve. A pressure sensor and an alarm lamp are further arranged on the steam sealing sleeve and electrically connected with the control module. According to the device, steam can be prevented from being leaked out of the valve rod, warnings are given to people through the pressure sensor and the alarm lamp, and therefore the temperature control device can control the temperature of hot water in the hot pool quite effectively.