Printed circuit board

The utility model provides a printed circuit board. A packaging area of the printed circuit board is provided with a left-right wire outlet area and an upper-lower wire outlet area. In the left wire outlet area and the right wire outlet area, first grounding via holes are formed in the vertical direction corresponding to two via holes of a high-speed differential wire on the bonding pad device, and a second grounding via hole is formed between the two via holes of the high-speed differential wire on the bonding pad device; in the upper and lower wire outlet areas, a fifth grounding via hole is configured between two via holes of a high-speed differential wire on the bonding pad device; a sixth grounding via hole is arranged between the two high-speed differential lines of the two via holes on the bonding pad device and located in the external area of the bonding pad device; and a connecting line of the fifth grounding via hole and the sixth grounding via hole is perpendicular to a connecting line of two via h