The invention relates to the technical field of connectors, in particular to a connector with a novel plug-in structure, which comprises a metal shell and a plastic shell, a plurality of terminal mounting columns are arranged on the metal shell in an array manner, the plastic shell is provided with a plurality of mounting cavities, and the terminal mounting columns of the metal shell are inserted into the mounting cavities of the plastic shell. A plug-in concave part is arranged between the terminal mounting columns, the plug-in concave part comprises a plurality of symmetrically arranged T-shaped grooves, a plug-in convex part is correspondingly arranged on the plastic shell, the plug-in convex part is a T-shaped column arranged corresponding to the T-shaped grooves, the T-shaped grooves comprise an outer groove and an inner groove, and clamping hooks are arranged on two sides of a notch of at least one of the outer groove and the inner groove. The T-shaped column comprises an outer column and an inner column which are connected together, the adjacent side faces of the outer column and the inner column abut against the step face of the outer groove, the connector is compact in structure, mold structure design is facilitated, the metal shell and the plastic shell are convenient to assemble and plug, connection is tight, the connection strength is high, looseness is avoided, and stable connection of the terminals in the connector is effectively guaranteed.