Provided is a metal shell cutting and assembling machine for cutting a material tape with metal shells and assembling the metal shell with a plastic body of a connector. The metal shell cutting and assembling machine includes a frame, a material-feeding mechanism, a pre-press mechanism, a metal shell-cutting mechanism, a plastic body-inserting mechanism, a metal shell-inserting mechanism and a controller. The material-feeding mechanism is used for transferring the material tape. The pre-press mechanism can pre-press the metal shell of the material tape for being cut by the metal shell-cutting mechanism. The metal shell-inserting mechanism can push the metal shell held between the pre-press mechanism and the metal shell-cutting mechanism onto the plastic body-inserting mechanism, and the plastic body-inserting mechanism pushes the plastic body for assembling with the metal shell. Whereby the metal shell cutting and assembling machine can enhance the manufacture efficiency and reduce the labor cost.