A connector and a transmission wafer thereof are provided. The transmission wafer includes an insulating frame, a plurality of grounding terminals fixed to the insulating frame, and a first shielding member disposed on the insulating frame. At least one of the grounding terminals includes a main segment and a parasitic segment separate from the main segment. The main segment includes a transmission portion fixed in the insulating frame and a tail portion that protrudes from the insulating frame. The parasitic segment includes a fixing portion fixed in the insulating frame and a parasitic contact portion that protrudes from the insulating frame. The first shielding member includes a plurality of first internally connecting arms respectively connected to the grounding terminals, and at least one of the first externally connecting arms is sandwiched between a first edge of the transmission portion and a second edge of the fixing portion.