The invention discloses a three-wheel scooter. The scooter comprises a handlebar(1), a front pike stand pipe (3), a connection base (4), left and right pedal tubes (6, 7), a front wheel (9), a universal rear wheel (10) and a braking device (2), wherein the left and right pedal tubes (6, 7) are rotationally arranged on a rotation shaft (20), a folding device is arranged between the connection base (4) and the left and right pedal tubes (6, 7), the device comprises a lock screw stem (5), a positioning shaft (11) and left and right positioning plates (17, 23), the positioning shaft (11) is arranged on a left and right guide groove (21), the lock screw stem (5) is connected with the positioning shaft (11), the left and right positioning plates (17, 23) are provided with a driving bayonet (16) and a folding bayonet (18) symmetrically, and the two ends of the positioning shaft (11) are locked on the driving bayonet (16) or the folding bayonet (18). After adopting the structure, the scooter has the advantages of simple and reasonable structure, convenient folding operation, safe and stable use, low noise, long service life and the like.