The present invention provides a self-moving device, including: a housing, in which a primary cavity is formed; a moving module, mounted on the housing, and configured to actuate the self-moving device to move; a primary working module, mounted on the housing, and configured to perform a work task; a control module, including a main control board, and configured to control the moving module to actuate the self-moving device to move, and control the primary working module to perform the work task, where: the main control board is disposed in the primary cavity, where at least one secondary cavity is further formed in the housing; the secondary cavity is configured to mount at least one functional module different from the moving module and the primary working module; and the self-moving device includes at least one first interface corresponding to the secondary cavity and capable of connecting to a second interface of the functional module, and the first interface is connected to the second interface, so that the functional module is mounted to the secondary cavity.