The embodiment of the invention discloses a circuit board group, which comprises a first circuit board, a second circuit board and a third circuit board, wherein the circuit board group also comprises a first connector group and a second connector group which are used to fix the second circuit board and the third circuit board on the first circuit board respectively; the first connector group comprises a first front part fixedly connected with the second circuit board, as well as a first back part fixedly connected with the first circuit board; the first front part is fixedly connected with the first back part; the second connector group comprises a second front part fixedly connected with the third circuit board, as well as a second back part fixedly connected with the first circuit board; and the second front part is fixedly connected with the second back part. By fixedly connecting the circuit boards with different surfaces of the first circuit board, the circuit board group ensures that the space requirements of remaining circuit boards do not need to be considered at all when additional circuit boards are replaced. The embodiment of the invention also discloses an electronic device applying the circuit board group.