Electronic control air suspension system, control method thereof and vehicle

The invention discloses an electric control air suspension system, a vehicle and a control method of the electric control air suspension system, and the control method of the electric control air suspension system comprises the steps that under the condition that constant electric voltage is input but ignition is not carried out, a communication module provides a first trigger signal for the input end of a first power conversion unit through a led-out signal line; the first power supply conversion unit performs voltage conversion based on the constant electric voltage and the first trigger signal to obtain a first working voltage; the ECAS main control chip works based on the first working voltage; the output end of the ECAS main control chip provides a second trigger signal; the second power supply conversion unit performs voltage conversion based on the constant electric voltage and a second trigger signal to obtain a second working voltage; and the electric component works based on the second working volta