A smart toilet with a function of electrocardiographic lead monitoring, includes a toilet base, and further includes a body connected to the toilet base. The body is provided with a controller, and an electrocardiographic lead monitoring module, a display or voice prompt module, a power supply module for supplying power, which are electrically connected to the controller respectively. The human body ECG signal obtained by the electrocardiographic lead monitoring module is processed by the controller, to obtain human body electrocardiographic lead data, and the display or voice prompt module is controlled to output the data. The invention combines the electrocardiographic monitoring function with the toilet, which enables people to know electrocardiographic data quickly and conveniently while using the toilet, so as to understand their own heart health, thereby detecting and dealing with possible diseases as soon as possible.