A sterilizing machine (10) for loose products, comprising at least a treatment chamber (11) to sterilize said loose products, a loading zone (14) for loading the loose products into the rotary drum (13), a discharge zone (15) for the loose products after sterilization, an automatic loading apparatus (17) to feed the loose products automatically into the rotary drum (13) inside the treatment chamber (11) and a dosing receptacle to load the loose products into the rotary drum.