Electronic device and circuit module thereof

The invention relates to an electronic device and a circuit module thereof. The circuit module is electrically connected with a circuit substrate unit, the circuit substrate unit comprises a power output end, the circuit module comprises a substrate, a step-up circuit and a plasmatron, the substrate is provided with at least one through hole, and the substrate is used for connection with the circuit substrate unit in a direction opposite to the thickness side; the step-up circuit, which is arranged on the substrate, comprises at least one conductive circuit and a plurality of electronic elements electrically connected with the conductive circuit, the conductive circuit comprises a power input end capable of electrically connecting with the power output end and two power output ends, and the electronic elements are inserted in the through holes; the two opposite ends of the plasmatron are provided with electrodes which are electrically connected with the power output ends. The electronic device comprises the circuit module and the circuit substrate unit electrically connected with the circuit module, and the circuit substrate unit is connected with the substrate of the circuit module in a direction opposite to the thickness side. When plugged in a mainboard, the electronic device does not easily occupies a space, so that more electronic devices can be plugged in the mainboard.