In order to analyze the influence of different contents of silica powder and polypropylene fiber on the crack resistance of regenerated concrete beams, ANSYS finite element analysis was carried out on the crack load, ultimate load, stress distribution and load-deflection curve of 5 regenerated concrete beams. The results show that the addition of silica powder and polypropylene fiber increases the strength and overall stiffness of the recycled concrete, improves the tensile stress resistance of the beam, enhances the crack resistance, improves ductility, and increases the cracking load and ultimate load. When the content of silica powder was 8% and the content of polypropylene fiber was 0.9kg /m3, the cracking load and ultimate load of the specimen reached the maximum value of 23.66kN and 128.5kN respectively, which were more than 20% higher than that of SF₀P₀.