A circuit board comprising a first sub-circuit board, a second sub-circuit board and a circuit connection structure, the first sub-circuit board being electrically connected to the second sub-circuit board through the circuit connection structure, wherein the first sub-circuit board comprises a first connection terminal, the second sub-circuit board comprises a second connection terminal, the circuit connection structure comprises a first port configured to match with the first connection terminal and a second port configured to match with the second connection terminal, wherein the first connection terminal, the second connection terminal, the first port, and the second port are configured such that when the first sub-circuit board is electrically connected to the second sub-circuit board through the circuit connection structure, a first connection terminal end face faces the first port in a first direction, and a second connection terminal end face faces the second port in a second direction, wherein the first direction is perpendicular to a plane of the first connection terminal end face and points to the first port, the second direction is perpendicular to a plane of the second connection terminal end face and points to the second port, wherein an angle between the first direction and the second direction is greater than 90° and less than or equal to 180°, wherein the circuit connection structure comprises at least two circuit wirings in parallel with each other, each of the first connection terminal and the second connection terminal comprises at least two sub-terminals, each of the circuit wirings is connected to at least one sub-terminal of the first connection terminal and at least one sub-terminal of the second connection terminal, respectively, characterized in that, an angle between the plane of the board surface of the first sub-circuit board and the first direction is greater than 0° and less than or equal to 90°, and an angle between the plane of the board surface of the second sub-circuit board and the second direction is greater than 0° and less than or equal to 90°, wherein a spacing between two adjacent circuit wirings is greater than a width of a wider circuit wiring among the two adjacent circuit wirings and less than twice the width of the wider circuit wiring, a width direction of the circuit wirings is perpendicular to an extension direction of the circuit wirings. wherein the first sub-circuit board comprises a first connection terminal, the second sub-circuit board comprises a second connection terminal, the circuit connection structure comprises a first port configured to match with the first connection terminal and a second port configured to match with the second connection terminal, wherein the first connection terminal, the second connection terminal, the first port, and the second port are configured such that when the first sub-circuit board is electrically connected to the second sub-circuit board through the circuit connection structure, a first connection terminal end face faces the first port in a first direction, and a second connection terminal end face faces the second port in a second direction, wherein the first direction is perpendicular to a plane of the first connection terminal end face and points to the first port, the second direction is perpendicular to a plane of the second connection terminal end face and points to the second port, wherein an angle between the first direction and the second direction is greater than 90° and less than or equal to 180°, wherein the circuit connection structure comprises at least two circuit wirings in parallel with each other, each of the first connection terminal and the second connection terminal comprises at least two sub-terminals, each of the circuit wirings is connected to at least one sub-terminal of the first connection terminal and at least one sub-terminal of the second connection terminal, respectively, characterized in that, an angle between the plane of the board surface of the first sub-circuit board and the first direction is greater than 0° and less than or equal to 90°, and an angle between the plane of the board surface of the second sub-circuit board and the second direction is greater than 0° and less than or equal to 90°, wherein a spacing between two adjacent circuit wirings is greater than a width of a wider circuit wiring among the two adjacent circuit wirings and less than twice the width of the wider circuit wiring, a width direction of the circuit wirings is perpendicular to an extension direction of the circuit wirings.