The invention discloses a garbage sorting method, which is characterized in that a garbage sorting period comprises a piercing stage, a first discharge stage and a second discharge stage; during the piercing stage, garbage enters a main box from a feed inlet and then moves downward under the gravity of the garbage itself, and after passing through a first inclined board, the garbage inclines a certain angle to move along the parabolic trajectory such that a piercing needle on a piercing device pierces and twines the main garbage; during the first discharge stage, a first telescoping rod is started, a second inclined board is opened, the garbage which passes through the piercing device enters a crushing chamber, a drive motor is started to drive a stirring wheel and the garbage is crushed,and the crushed garbage passes through a second discharge port and is discharged out of the crushing chamber; and during the second discharge stage, the first telescoping rod is started, the second inclined board is closed, a second telescoping rod is then started to make a removing board move upwards to remove the garbage which twines the piercing needle, and the removed garbage passes through afirst discharge port and is discharged out of the main box. According to the invention, sorting of kitchen garbage is realized.