A modular electrical connector having the characteristics of simple manufacturing process, reduced manufacturing cost and high production yield is disclosed to include two signal terminal sets arranged one above the other in a staggered manner to provide a compensated structure, and an electrically insulative terminal block including a mounting block and a mating connection block and molded on the signal terminal sets by injection molding. The connection segments of the signal terminals of the two signal terminal sets are bent to move the mounting block and the mating connection block toward each other to further force a positioning portion of the mounting block into engagement with a positioning groove of the mating connection block.