Circuit board and electronic device using same

The invention provides a circuit board. The circuit board comprises a first outer layer, a second outer layer, and a first grounding layer and a second grounding layer located between the first outer layer and the second outer layer, wherein the first grounding layer is close to the first outer layer; the second grounding layer is close to the second outer layer; the first grounding layer is used as a main signal reference layer; at least one through hole is arranged on the circuit board and passes through the circuit board; all the first grounding layer is a circuit ground; the second grounding layer is divided into a housing ground and a circuit ground; and the through hole penetrates through the housing ground. According to the circuit board provided by the invention, the second grounding layer is partitioned into the housing ground and the circuit ground and the through hole penetrates through the housing ground, so that the electrostatic energy transmitted to the circuit board can be quickly conducted ou