Abstract: A plug-in mobile peripheral component interconnect express module connector is disclosed, comprising a plastic body, and a first terminal set and a second terminal set disposed relatively in the plastic body. The plastic body includes transversely penetrated slots, an upper end surface of the slots has intermittently plural upper magazines, and a lower end surface has intermittently plural lower magazines. The first terminal set includes plural first elastic terminals inserted in the upper magazines, and the second terminal set includes plural second elastic terminals inserted in the lower magazines. Each first elastic terminal is opposed to each second elastic terminal, forming a holding gap. A motherboard is inserted between the first elastic terminals and the second elastic terminals from a side, and an MXM board is inserted between the first elastic terminals and the second elastic terminals from the other side.