To solve the problem of uneven distribution characteristic of contact stress with dome pneumatic wheel finishing for large laser hardening mold, a new crown-type pneumatic wheel is designed, and the stress-strain relationship is obtained by the analysis of flexible reformation during the dynamic contact process. By comparing the different stress distribution of dome and crown-type models via finite element analysis and the effect of different compression to different sizes of crown-type models, it comes to the conclusion that the contact area of the crown-type pneumatic wheel is an approximate circular and the stress value performances Gaussian type distribution, which effectively overcomes the contact stress defects of central region with dome pneumatic wheel. The pneumatic wheel finishing experiment with the laser hardening Cr12 mold shows that the optimum amount of compression is 3, 4 and 5mm with diameter 40, 80 and 120mm respectively, and the average surface roughness is 150~160, 65~60 and 30~33 nm. The crown-type pneumatic wheel can effectively improve the finishing efficiency and surface accuracy, and different sizes fit different processing objects.