The invention discloses a combined sound box with a heat-dissipation function, and relates to the field of electronic products. The combined sound box with the heat-dissipation function comprises a sound box body, wherein the outside of the combined sound box body is coated with a heat-dissipation tube; a shell is arranged outside the heat-dissipation tube; a heat-dissipation tank is arranged at an upper end of the shell; the heat-dissipation tank comprises a tank body; a fan and a battery are arranged in the tank body; a fan output end communicates with the heat-dissipation tube through a blastpipe; the heat-dissipation tube is circular; the heat-dissipation tube comprises a tube body; and a plurality of heat-dissipation hole are formed outside the tube body. Specific to the problem of poor heat-dissipation effect caused by small internal heat-dissipation space in the conventional combined sound box, the circular heat-dissipation tube is matched with the plurality of heat-dissipationholes, so that the heat-dissipation effect of the combined sound box body is improved effectively; the unfavorable influence of heat generated during working of the combined sound box body on a deviceis lowered; and the service life is prolonged.