Abstract: An electronic building-block module includes a main body, multiple projections spacedly arranged on a top surface of the main body, a circuit board, multiple main connectors and multiple sub connectors; the electronic building-block module has multiple recesses which are provided at a bottom portion of the main body for respectively accommodating the multiple projections; the main body has a cavity therein, the circuit board is located within the cavity; each of the multiple projections has a cylindrical shape with an upper opening, the multiple main connectors are respectively located within the upper opening of the multiple projections; the multiple sub connectors are respectively located within a lower opening of the multiple recesses; the multiple main connectors of one electronic building-block module are respectively in nested connection with the multiple sub connectors of another electronic building-block module.