The invention discloses a garbage bag, relates to the field of plastic products and aims to solve the problem of inconvenience caused by the reason that a conventional garbage bag has high probabilities of being wholly rolled and dropping into a garbage can due to a small thickness or when blown by wind or impacted by a weight, and thus often needs to be re-lifted and put straight before garbage throwing. The garbage bag provided by the invention comprises a garbage body, wherein an elastic tightening belt is fixedly arranged at a bag opening of the garbage bag in a surrounding manner. As theelastic tightening belt is fixedly arranged at the bag opening of the garbage bag in a surrounding manner, when the garbage bag sleeves the garbage can, the bag opening can be firmly in contact with acan opening under the action of a tightening function of the elastic tightening belt. Thus, the garbage bag can be effectively prevented from being wholly rolled easily and dropping into the garbagecan when blown by wind or impacted by the weight.