Nonreciprocal charge transport phenomena are widely studied in two-dimensional superconductors, which demonstrate unidirectional-anisotropy magnetoresistances as a result of symmetry breaking. Here, we report a strong nonreciprocal transport phenomenon in superconducting CsV₃Sb₅ thin flakes. The second harmonic voltages, mainly originating from the rectification effect of vortex motion, are unambiguously developed with in-plane and out-of-plane magnetic fields, and their magnitudes are comparable to those in noncentrosymmetric superconductors. The second harmonic magnetoresistances split into several peaks and some of them reverse their signs by ramping the magnetic field or the current within the superconducting transition. The nonreciprocity suggests a strong asymmetry in CsV₃Sb₅. The centrosymmetric structure and symmetric electronic phases in CsV₃Sb₅ can hardly induce the distinct nonreciprocal transport phenomenon, which could be correlated to a symmetry breaking from an unconventional superconducting order parameter symmetry.

非互易电荷传输现象在二维超导体中得到了广泛的研究，其表现出由于对称性破坏而产生的单向各向异性磁阻。_{在这里，我们报告了超导 CsV 3} Sb ₅薄片中的强非互易输运现象。二次谐波电压主要源于涡旋运动的整流效应，是由面内和面外磁场明确产生的，其幅度与非中心对称超导体中的幅度相当。二次谐波磁阻分裂成几个峰值，其中一些通过使超导跃迁内的磁场或电流倾斜来反转它们的符号。非互易性表明 CsV 中存在强烈的不对称性₃锑₅。CsV ₃ Sb ₅中的中心对称结构和对称电子相几乎不会引起明显的非互易输运现象，这可能与非常规超导有序参数对称性的对称性破坏有关。