In the multidimensional reconciliation process of continuous-variable quantum key distribution (CVQKD), the error correction performance of the low-density parity-check code (LDPC) directly affects the reconciliation efficiency and transmission distance. Herein, a two-edge type low-density parity-check code (TET-LDPC) is constructed. We introduce a cumulative structure similar to that of a repeat-accumulate code into the TET-LDPC to improve its error correction performance. These codes obtain a smaller convergence signal-to-noise ratio, whereas the reconciliation system achieves higher coordination efficiency and longer transmission distance. The simulation results indicate that at a TET-LDPC code rate of 0.5 and a block length of 2×10 5, the convergence signal-to-noise ratio of the system is reduced to 1.02 dB, the data reconciliation efficiency is 98.58%, the security key rate reaches 17.61 kb/s, and the CVQKD transmission distance increases to 44.9 km.