A cordless liquid heating device (1000) is provided and includes an implement part (100) and a base part (200). The implement part (100) includes a liquid heating container and a temperature measuring device (110); the base part (200) is configured to supply electric energy to the implement part (100) through a cordless electric connector, the cordless electric connector achieves an electric connection when the implement part (100) is placed on the base part (200); the base part (200) includes an electronic control device configured to control an electric heater and a signal electric connection configured to transmit a temperature measured by the temperature measuring device (110) to the electronic control device in the base part (200); the signal electric connection and the cordless electric connector are separate components. The cordless liquid heating device (1000) facilitates maintenance thereof.