The invention discloses a multifunctional multiplexed high-speed signal co-lay routing structure and routing method. The routing structure comprises a CPU (central processing unit) chip, a PCH (platform controller hub) chip, a first switch chip, a second switch chip, a PCIE (peripheral component interface express) connector, an Oculink connector and a PCB (printed circuit board). The PCB is provided with first to eighth via holes and first to fourth co-lay resistors, a signal line is connected between the first via hole and the second via hole and corresponds to a routing line a1, a signal line is connected between the fourth via hole and the fifth via hole and corresponds to a routing line c, a signal line is connected between the seventh via hole and the eighth via hole and corresponds to a routing line a2, another signal line is led out of the eighth via hole and corresponds to a routing line b2, and a signal line is led out of a ninth via hole and corresponds to a routing line b1.By reasonable co-lay resistor placement and outgoing, a multifunctional single board is multiplexed, the same board card is compatible with various multifunctional application scenes without redundantly developing additional similar board cards, a large amount of cost is saved, design efficiency is improved, and the routing structure is simple and efficient.