An electrical connector includes: an insulating body provided with at least one groove, where at least one protruding block is provided in the groove; and at least one pair of signal terminals adjacently provided, accommodated in the insulating body and exposed in the groove. The pair of signal terminals includes a long signal terminal and a short signal terminal. Each of the long signal terminal and the short signal terminal has a first section and a second section bending and extending from one end of the first section. A length of the long signal terminal is greater than a length of the short signal terminal. An area of the short signal terminal covered by the protruding block is larger than an area of the long signal terminal covered by the protruding block, which is equivalent to setting an obstruction for the short signal terminal.