Programmable building block system

The utility model discloses a programmable building block system which comprises a main control box, a circuit board is arranged in the main control box, operation keys and a communication interface which are electrically connected with the circuit board are arranged on the main control box, a plurality of first connecting holes are further formed in the outer wall of the main control box, and first conducting strips are arranged in the first connecting holes. Each functional module is packaged in the corresponding shell, a second connecting hole is formed in the back of the shell, and a second conducting strip is arranged in the second connecting hole; and the conductive connecting piece can be inserted into the first connecting hole and the second connecting hole and is used for connecting the main control box and the functional module. The main control box is connected with different functional modules through the conductive connecting pieces, so that multiple shapes are formed through splicing, correspond