The invention relates to high-speed motor rotor non-oriented silicon steel with yield strength larger than or equal to 500 MPa. The high-speed motor rotor non-oriented silicon steel comprises the chemical components including, by weight percent, 2.5%-4.5% of Si, 0.8%-2.0% of Al, 0.5%-2.0% of Mn, not larger than 0.005% of N, not larger than 0.002% of S, not larger than 0.003% of C, not larger than0.05% of P, not larger than 0.05% of Cu and not larger than 0.01% of Ti+Nb+V+Zr. A production method comprises the steps that RH vacuum refining is carried out after converter smelting; a casting blank is heated; fine rolling is carried out after rough rolling; reeling is carried out; acid pickling is carried out; cold rolling is carried out; and annealing is carried out. Compared with the prior art, under the condition that extra alloying elements are not added and a conventional process is omitted, the mechanical strength of the non-oriented silicon steel can be effectively improved, the yield strength is larger than or equal to 500 MPa, and the iron loss of finished products with the thicknesses being 0.35 mm or below is P1.0/400<=18 W/kg.