Self-service master-slave machine

The utility model discloses a self-service child-mother machine which comprises a child machine and a mother machine, and the mother machine is provided with at least one supplementary function module different from the self-service function of the child machine. The son machine and the mother machine are connected in a quick-release mode through a quick-release assembly, and meanwhile quick-plug connectors are arranged at the corresponding positions for communication connection. When the son-machine and the mother-machine are detached and separated, the son-machine and the mother-machine can be independently used only by installing a screen on the mother-machine. When the son machine is installed on the mother machine, the mother machine supplements the self-service function of the son machine. Therefore, the self-service equipment can be modularized according to needs, different self-service function modules are arranged on different sub-machines and different mother machines, a uniform quick-release assemb