A compact tunable power divider is proposed in this brief. The power divider can achieve a wide frequency tuning range and good matching and isolation performances. Theoretical equations for the characteristic impedance and the electrical length of the power divider are derived. For demonstration, a prototype working at 1.5 GHz as the center frequency is designed and fabricated. The measured results show that the power divider can be effectively tuned within the frequency range of 104% (0.83-2.4 GHz) with a return loss and isolation better than 20 dB and insertion loss varying between -3.3 dB and -3.5 dB.