Recently, the synthetic impedance circuit was introduced to realize smart metamaterial with adaptability and multifunction. However, it is difficult to calculate the exact theoretical value of the synthetic inductor, and it is also complicated to adjust the circuit resonance manually. To address this problem, we design a type of intelligence piezoelectric metamaterial beam with self-tuning capabilities. The RMS response of voltage signals collected by ADC is selected as the tuning standard, and the output voltage of DAC is constantly adjusted by the hill-climbing algorithm to calculate the RMS. When the RMS response gets the maximum value, the control circuit achieves the best control effect, thus providing the optimal control voltage to the voltage-controlled resistor. Experiments demonstrate that the proposed smart piezoelectric metamaterials can accurately attenuate vibration at the resonant frequency and form a broad bandgap nearby. The strategy facilitates the application of vibration control under wideband dynamic loads.