Abstract: An electronic charging device for vehicles comprises a stretchable contact head, a housing connected with the contract head, an outside diameter of a bottom part of the housing is equal to an inside diameter of a power taking mouth of a vehicle cigarette lighter, a power adapter is located inside the housing, the power adapter has a first electrode contact and a second electrode contact, the first electrode contact is located at the bottom part of the housing, a top area of the contract head is defined as the second electrode contact, a top part of the housing has a charging port, the charging port is connected with the power adapter, the housing further includes a limiting element, the limiting element is clamped with the contract head through a clamping piston structure, the housing further has a spring, one end of the spring resists the contract head.