Aiming at the problems of random failure position, large amount of steel cutting and excessive welding length of traditional cross-core concrete-filled steel tube buckling-restrained brace ( CSBRB), a new type of perforated cross-core concrete-filled steel tube buckling-restrained brace (PCSBRB) is proposed in this paper. The structure and characteristics of PCSBRB are introduced, and the calculation equation of basic mechanical parameters is given. Six groups of PCSBRB models with different opening parameters and one group of CSBRB models are designed, and the quasi-static finite element analysis is carried out by ABAQUS software. The effects of the structural rationality of PCSBRB, the opening ratio and the number of openings on the mechanical properties, energy dissipation performance, stress distribution, high-order deformation characteristics, in-plane instability of the opening section and the equivalent cumulative plastic strain of PCSBRB are studied. The analysis results show that the structure of PCSBRB is reasonable, and the bearing capacity and energy dissipation performance are similar to those of CSBRB. The yield area of PCSBRB is located in the opening section, which has the advantages of fixed-point yield and multi-point energy dissipation. The hysteresis curves of PCSBRB with reasonable design is stable, full and symmetrical. For PSCBRB with too small opening rate, the stress is concentrated at the limit hole, and the purpose of fixed-point yielding cannot be achieved. For PCSBRB with too large opening rate, the opening section is prone to in-plane instability, resulting in a decrease in the bearing capacity of PCSBRB. The opening rate of PCSBRB should be 33%~50%. When the total length of the opening section is 1500 mm, the number of openings is set to 4~8, and the performance is similar. Compared with CSBRB, PCSBRB has higher material utilization and lower welding cost.