An electrical connector module is used to mate with a mating connector module. The mating connector module has a first mating connector and a second mating connector. A first electrical connector is inserted with the first mating connector. One side of the first electrical connector is provided with a protruding block. A second electrical connector is inserted with the second mating connector. One side of the second electrical connector close to the first electrical connector is provided with a groove corresponding to the protruding block. The protruding block is accommodated in the groove. A length of the groove along an insertion direction is greater than a length of the protruding block along the insertion direction. The protruding block slides in the groove along the insertion direction.