A suction cover structure of a breast pump, the structure comprising an internal suction cover assembly and an external support frame (4) the internal suction cover assembly comprises a large-opening sealed inner ring sheet (3), a breast protection cover body (2) and a cup connector (5) the breast protection cover body (2), the large-opening sealed inner ring sheet (3) and the cup connector (5) are seamlessly integrated via two shot injection molding the large-opening sealed inner ring sheet (3) and the cup connector (5) are made of PPSU material and the breast protection cover body (2) is made of SIL liquid silica gel. Compared with the prior art, the suction cover structure has the following advantages: (1) being used after cleaning and sterilization without reassembly, thus avoiding physical aging of and damage to the breast cover structure caused by frequent assembly and disassembly (2) having good thermostability, with the suction cover being difficult to deform after sterilization at a high temperature (3) having good air tightness, thus ensuring the overall sealing property of the breast pump.Linvention concerne une structure de couvercle daspiration dun tire-lait, la structure comprenant un ensemble couvercle daspiration interne et un cadre de support externe (4) lensemble couvercle daspiration interne comprend une feuille annulaire intérieure scellée à grande ouverture (3), un corps de couvercle de protection de sein (2) et un raccord de ventouse (5) le corps de couvercle de protection de sein (2), la feuille annulaire intérieure scellée à grande ouverture (3) et le raccord de ventouse (5) sont intégrés de façon homogène par un moulage par injection en deux étapes la feuille annulaire intérieure scellée à grande ouverture (3) et le raccord de ventouse (5) sont faits de matériau PPSU et le corps de couvercle de protection de sein (2) est fait de gel de silice liquide SIL. Par comparaison avec létat antérieur de la technique, la structure de couvercle das
