The invention discloses a vehicle starting device and the method thereof. The device comprises a signal acquisition module (3), a controller module (4) and an execution module (5), wherein, the signal acquisition module (3) and the execution module (5) are respectively and electrically connected with the controller module (4); the signal acquisition module (3) is used for monitoring power supply conditions to a power supply circuit in ON position of the vehicle; the controller module (4) is used for receiving power supply signals transmitted by the signal acquisition module (3), and sending close signals to the execution module (5) after receiving the power supply signals; and the execution module (5) is used for controlling the electrical path connection between a normalizing electric line and the load of a vehicle. In addition, the invention further provides a corresponding vehicle starting and controlling method. The device and the method can monitor and control the power supply and the starting conditions of the vehicle, so that the power supply and starting operations can be reliably performed on vehicles in time.