A housing assembly, comprising: a housing, defining a mounting groove; and an engaging member, arranged in the mounting groove and capable of moving relative to the housing, wherein the engaging member is configured to move to provide an avoidance space for a connector to be inserted into or removed from the mounting groove; during the movement of the connector from a first position to a second position in the mounting groove, the engaging member is configured to move within a limited position and restore to engage with the connector, wherein the movement of the engaging member is a linear movement, the moving direction of the engaging member is different from the inserting direction or removing direction of the connector, the mounting groove comprises a first mounting groove and a second mounting groove connecting with each other, the first mounting groove has a first opening and the second mounting groove has a second opening, the housing comprises a plurality of side faces (2302, 2304, 2306) connected to each other, the first opening is defined in one of the side faces (2302, 2304, 2306), and the second opening is defined in an adjacent side face (2302, 2304, 2306) of the housing, characterized in that, the housing defines a sink, the first opening is defined by a bottom wall of the sink; the housing assembly further comprises a baffle whose shape matches the shape of the sink; the baffle is mounted in the sink, the baffle defines a through hole through which the connector passes; a thickness of the baffle is less than a depth of the sink, and an accommodating space is formed at a side of the baffle away from the bottom wall of the sink, the accommodating space is configured to accommodate a part of the connector. a housing, defining a mounting groove; and an engaging member, arranged in the mounting groove and capable of moving relative to the housing, wherein the engaging member is configured to move to provide an avoidance space for a connector to be inserted into or removed from the mounting groove; during the movement of the connector from a first position to a second position in the mounting groove, the engaging member is configured to move within a limited position and restore to engage with the connector, wherein the movement of the engaging member is a linear movement, the moving direction of the engaging member is different from the inserting direction or removing direction of the connector, the mounting groove comprises a first mounting groove and a second mounting groove connecting with each other, the first mounting groove has a first opening and the second mounting groove has a second opening, the housing comprises a plurality of side faces (2302, 2304, 2306) connected to each other, the first opening is defined in one of the side faces (2302, 2304, 2306), and the second opening is defined in an adjacent side face (2302, 2304, 2306) of the housing, characterized in that, the housing defines a sink, the first opening is defined by a bottom wall of the sink; the housing assembly further comprises a baffle whose shape matches the shape of the sink; the baffle is mounted in the sink, the baffle defines a through hole through which the connector passes; a thickness of the baffle is less than a depth of the sink, and an accommodating space is formed at a side of the baffle away from the bottom wall of the sink, the accommodating space is configured to accommodate a part of the connector.