The utility model relates to a motorcycle automatic double clutch which includes a primary clutch and a secondary clutch. The primary clutch includes a driving gear, driving disc components, an extension spring, a starter clutch, a shoe, a large round nut and a motor cover. The secondary clutch includes an outer cover combination, an axle sleeve, a central set combination, a driven gear, a friction disc, a driven sheet, a cam board, a connecting rod assembly, an adjusting bolt, a bearing, locking nuts and a spring. The characters are: the driving gear of the primary clutch is pressed with a bush and an accessory gear. A torsion spring is provided between the bush and the accessory gear. The driving gear and the accessory gear both mesh with the driven gear. The central set component of the secondary clutch is provided with three friction discs and two driven sheets. The outer cover combination is provided with 8 grooves which have equal intervals. 8 convex teeth of the three friction discs cooperate with the 8 grooves. The inner teeth of the driven sheets cooperate with the outer teeth of the central set component. The utility model relates to an automatic double clutch for motorcycles, comprising a primary clutch and a secondary clutch. The primary clutch comprises a driving gear, a driving disk component, a tension spring, a one way device, a hoof block, a large circle nut and a cover. The secondary clutch comprises a casing combination, a shaft sleeve, a center sleeve combination, a driven gear, friction disks, driven pieces, a cam plate, a connecting rod assembly, an adjusting bolt, a bearing, a locking nut and a spring. The utility model is characterized in that the driving gear of the primary clutch is pressed with a lining and a secondary gear; a torsion spring is arranged between the lining and the secondary gear; the driving gear and the secondary gear are engaged with the driven gear of the secondary clutch; three friction disks and two driven pieces are at intervals arranged in the center sleeve combination of the secondary clutch; the casing combination is provided with eight grooves with a same distance; the eight convex tooth of the three friction disks are matched with the eight grooves; the internal tooth of the driven piece is matched with the external tooth of the center sleeve combination.