We investigate the observability of the top anomalous tqZ couplings via the trilepton signatures at the Large Hadron Collider (LHC) with the center-of-mass energy of 14 TeV. We focus on signals of the tZ associated production with the decay mode t→W+b→bℓ+νℓ, Z→ℓ+ℓ−, and tt¯ production with the decay mode t¯→Z(→ℓ+ℓ−)q¯ and t→bℓ+νℓ, where ℓ=e,μ and q reflects up and charm quarks. It is shown that at 3σ level, the FCNC top quark decay branching ratios can be probed at, respectively, about Br(t→uZ)≤1.3×10−4 and Br(t→cZ)≤4.2×10−4 with the integrated luminosity of 100 fb−1, and probed down to Br(t→uZ)≤2.2×10−5 and Br(t→cZ)≤8×10−5 for the high-luminosity LHC with 3000 fb−1.