The utility model discloses a medical electrothermometer, including casing (11), (11) one terminal surfaces of casing are equipped with switch (8) and display unit (7), another terminal surface of casing (11) is equipped with detecting element (10), be equipped with detector (1), sensor (2), control module (3), display module (4), prompt tone module (5) and mains operated module (6) in casing (11), detector (1) and sensor (2) looks adaptation, control module (3) are connected with mains operated module (6) through the connecting wire, control module (3) and display module (4) and prompt tone module (5) looks adaptation, display unit (7) and display module (4) looks adaptation.