The invention discloses an automatic control system and method of a domestic sauna room. The automatic control system comprises a detection device, a comparison device and a control device; the detection device is arranged at the inner wall of the sauna room, and is used for detecting life parameters of a user; the comparison device is in communication with the detection device, is arranged between the inner wall and the outer wall of the sauna room, and is used for comparing the life parameters with the highest threshold value and the lowest threshold value; the control device is in communication with the comparison device, is arranged on the outer wall of the sauna room, and is used for controlling switch-on and switch-off of the sauna room. The automatic control system and method of the domestic sauna room have the advantages that through a non-contact heartbeat detecting instrument, heart rate values of the user are detected in real time, automatic switch-on and automatic switch-off of the sauna room are controlled through the change of the heart rate values, and the use is more intelligent.