The Pb(Zn1/3Nb2/3)0.2(Hf1-xTix)0.8O3 (PZNH1-xTx) perovskite piezoceramics were prepared by a two-step columbite precursor method. The effects of the ratio of Hf and Ti on the phase structure, electrical performance and energy harvesting characteristics were investigated. The results show that x=0.52 is located at the morphotropic phase boundary, and has the optimal comprehensive piezoelectric properties: Curie temperature TC of 287 ℃, figure of merit FOM of 14 753×10-15 m2/N, piezoelectric charge constant d33 of 492 pC/N. In addition, the cantilever beam-type piezoelectric energy harvester constructed from x=0.52 sample exhibited an output power density of up to 4.16 μW/mm3 and the generated power can successfully lit 138 parallel LED lights. The above results show that PZNHT ceramics have good application potential in the field of piezoelectric energy harvesting.