Abstract: The earliest fossil suoid collection of the world from Guangxi, China, is identified as four taxa. Eocenchoerus gen. nov. is assigned to Suidae based primarily on the presence of a talon on M3. The Eocene suid indicates that the origin of Suidae is as early as that of Palaeochoeridae and Tayassuidae. The family Palaeochoeridae is accepted to group the Old World palaeochoerids, Siamochoerus viriosus sp. nov. and Huaxiachoerus guangxiensis gen. et sp. nov. are included in it, and Huaxiachoerus is considered close to Cynorca. A single upper molar is identified as a tayassuid, and is close to the typical tayassuid Perchoerus. If Cynorca and Perchoerus are indeed the root members of the two major evolutionary radiation of the World tayassuids, the New World tayassuids should evolve from their Old World ancestors. The diversified suoid group in the Asian Late Eocene suggests the split of Suidae, Palaeochoeridae and Tayassuidae might begin at the Middle Eocene or earlier period.