The present invention discloses a mother-son piano capable of splitting and converting sound production modes. The mother-son piano comprises a piano main body; a piano keyboard consisting of a folding or curling keyboard and a plurality of keys, the keys being positioned and arranged on the keyboard to form a folding integrated piano keyboard, the piano keyboard being integrally and detachably installed on the piano main body; and a frequency division simulation circuit board consisting of a plurality of frequency division simulation circuit blocks corresponding to the keys, the piano keys being connected with the frequency division simulation circuit board. The frequency division simulation circuit board is connected with a power supply and a vocal apparatus and realizes the sound production mode switching of the sound production of the piano main body and the sound production of the vocal apparatus through the control of a switch, so that the defects are overcome that an upright piano is inconvenient for carrying and an electronic piano and a hand roll piano is poor in key touch feeling and the effect of one piano with multifunction is achieved.