The invention discloses a height-adjustable automatic supporting foot stool for an
electric vehicle. The left end and the right end of the straight tooth
bevel gear transmission mechanism are both coaxially connected with an
electromagnetic lock transmission mechanism, wherein the
electromagnetic lock transmission mechanism is coaxially sleeved with a first gear, and the first gear is connected with a second gear through a
toothed belt; a central gear connecting sleeve of the second gear is coaxially and fixedly connected with a third gear; a horizontal rack meshed with the third gear is arranged on the upper section of the foot stool; the
electromagnetic lock transmission mechanism is composed of a battery, an
electric wire, a hollow transmission shaft, a first rotating shaft sleeve, two T-shaped electromagnets and a second rotating shaft sleeve which have the same central shaft. The straight tooth
bevel gear transmission mechanism is driven by the motor to transmit power to the gear rack mechanism, and the foot stool is driven to ascend or descend. When the electromagnets on the left side and the right side are electrified simultaneously, the foot stools on the two sides can ascend or descend simultaneously; if the
electromagnet on one side is powered off, the
power transmission on the side is interrupted; therefore, independent control over ascending or descending of the left foot stool or the right foot stool can be achieved according to different parking road conditions.