Abstract: In order to improve the dielectric and mechanical properties of silicone rubber, zero-dimensional onion-like carbons (OLCs) and two-dimensional boron nitride nanoplates (BN) were added to the silicone rubber (SR) to prepare OLCs/BN/SR composites. Through systematic study of the prepared composites, it is found that the fillers can be uniformly dispersed in the polymer matrix, and the dielectric and mechanical properties of OLCs/BN/SR composites were obviously enhanced. When 1.2 wt% OLCs and 9 wt% BN nanoplates were added to the SR, the dielectric constant of the composite increased to 7.31, while the dielectric loss was as low as 0.00152. This is mainly because the coordination effect between the different fillers improves the dispersion of the fillers in the polymer matrix and enhances the interfacial polarization effect in the composites. The composites also showed good flexibility, i.e. the elongation at break was 748% and the elastic modulus was 227 kPa. Therefore, the coordination between low dimensional fillers of different dimensions can make the composites exhibit high dielectric constant, low dielectric loss and low elastic modulus.