The present invention provides a resonator with a resistor-capacitor loop, a base, a base group and a base preparation method, which are applicable to the technical field of resonators. The resonator comprises a base, a quartz-crystal harmonic oscillator and an upper cover. The base comprises a substrate, wherein the bottom surface of the substrate is provided with bonding pads; and the top surface thereof is provided with lower electrodes. The substrate is provided with through holes, and electrical conductors for connecting the top surface with the bottom surface of the substrate are inserted in the through holes. The lower electrodes are electrically connected to some electrical conductors, a dielectric covers each of the lower electrodes, and a resistor layer covers the top surface of the substrate; upper electrodes are paved on the dielectrics and some electrical conductors, and one ends of the upper electrodes are electrically connected to some electrical conductors to form a capacitor; and the other ends thereof are electrically connected to the resistor layer to form a resistor, and are connected with the bonding pads through the lower electrodes and the electrical conductors to form a resistor-capacitor loop. The resonator provided by the present invention has the advantages that the limited space of a PCB is saved so that the product can be miniaturized; a mounting step is omitted so that the production efficiency is improved; and in addition, the influence of external component errors is reduced so that the frequency accuracy of an oscillator is improved.