In order to explore the seismic performance of Concrete-Filled Double Steel Plate Composite Shear Wall after fire, the temperature field model and mechanical model were established and verified. Based on the same modeling method, a full-scale model of shear wall before and after fire was established to analyze the influences of different parameters on the seismic performance of shear wall. The results show that:(1) Before fire, increasing the axial compression ratio and shear span ratio can improve the flexural bearing capacity and deformation capacity of the wall. Increasing the reinforcement ratio of the wall can improve the flexural bearing capacity, but has little effect on the deformation capacity; (2) With the increase of fire time, the initial stiffness and shear capacity of the wall decrease. The larger axial compression ratio, the greater the impact of fire time; (3) After a long time fire, the failure mode of the wall with a large height-thickness ratio and a large axial compression ratio changes into the failure mode that the whole wall rapidly loses stability towards the fire side and the seismic performance deteriorates sharply; (4) For the wall with bending failure, fire increases the deformation capacity of the wall, whereas the overall instability of the wall caused by fire will weaken the deformation capacity of the wall for the wall with compression-flexure failure.