The invention discloses a multi-pin connector assembly. The multi-pin connector assembly comprises a multi-pin connector and a PCB matched with the multi-pin connector; the top ends of the pins of themulti-pin connector pass through positioning holes in the PCB and extend to the back of the PCB; and an annular tin blocking sleeve is arranged around each of the pins on the back of the PCB. According to the multi-pin connection assembly of the invention, the pins are less prone to the problems of tin adhesion, tin inadequacy and tin bead scattering during welding. The multi-pin connector assembly has the advantages of great universality and good effect. With the multi-pin connector assembly adopted, all the welding quality problems of the multi-pin connector can be solved, the installationreliability of the connector is ensured, and thus, the stability and safety of products can be ensured.