A waste collecting device (100), an abutment device (200), and a waste collecting and processing system (10). The waste collecting device (100) is used for collecting waste generated in a medical process and used for abutting the abutment device (200) to discharge the waste, and the waste collecting device (100) comprises: a portable trolley (108); at least one waste collecting container (109), the at least one waste collecting container (109) being mounted in the portable trolley (108) and used for storing waste generated in a medical process; a fitting support (110), the fitting support (110) being mounted on the portable trolley (108) and used for fitting the abutment device (200); two collection end connectors (112, 114), the two collection end connectors (112, 114) being attached to the fitting support (110) and respectively connected to the at least one waste collecting container (109); and two floating sleeves (111, 113), the two floating sleeves (111, 113) being mounted on the fitting support (110), and correspondingly sleeved on the two collection end connectors (112, 114). The floating sleeves (111, 113) lead abutment end connectors (211, 213) to connect with corresponding collection end connectors (112, 114). Higher precision, a simple structure, and low manufacturing costs are achieved.L'invention concerne un dispositif de collecte de déchets (100), un dispositif de butée (200) et un système de collecte et de traitement de déchets (10). Le dispositif de collecte de déchets (100) est utilisé pour collecter des déchets issus d'un processus médical et pour venir en butée contre le dispositif de butée (200) afin d'évacuer les déchets. Le dispositif de collecte de déchets (100) comprend : un chariot portable (108); au moins un récipient de collecte de déchets (109), lequel est monté dans le chariot portable (108) et utilisé pour stocker des déchets issus d'un processus médical; un support d'ajustement (110), lequel est monté sur le chariot portable (108) et u