The present invention discloses a trash bag assembly, a trash bag fitting device and a smart trash receptacle. The trash bag assembly includes a storage body and a lid. The storage body defines a first opening and an annular trough extending externally around the first opening and configured to receive a trash bag. The lid defines a second opening corresponding to the first opening and is configured to cover an open end of the annular trough so as to form, together with one side wall of the annular trough, a gap serving as a bag exit. The trash bag fitting device is configured to fit a trash bag into a main body of a trash receptacle and includes a vacuum assembly and a motor for driving the vacuum assembly. The vacuum assembly includes an air inlet and an air outlet. The air inlet communicates with an air vent in an inner wall of the main body, with the air outlet in communication with the outside of the main body of the trash receptacle. A combination of the trash bag assembly and the trash bag fitting device enables fully-automatic trash bag fitting and bagging, an increased degree of automation and intelligence of the trash receptacle, low cost and higher replacement efficiency.
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