The invention discloses a high-shear reactor for a rapid competitive reaction. The high-shear reactor comprises a cylindrical shell, a rotor, a stator and a main transmission shaft, wherein the cylindrical shell is provided with a discharging hole; a first feeding tube is arranged at the center position of an end wall at one end of the cylindrical shell; a radial flow impeller is arranged at the tail end of the main transmission shaft and interior of the innermost-circle rotor teeth; feeding stator teeth 2 being of a hollow structure are arranged between primary innermost-circle rotor teeth and secondary innermost-circle rotor teeth; a hollow part of the feeding stator teeth 2 is communicated with a second feeding tube 10 through an annular hollow structure 12 in the end wall 11; the feeding stator teeth 2 are provided with discharging holes 9. By adopting the reactor, two strands of materials can be effectively prevented from coming into contact in a non-height turbulent area, a strand of the materials fed from the center can get greater kinetic energy, back-mixing of the materials is prevented, and the two strands of the materials are mixed uniformly within a millisecond. The occurrence of side reactions is avoided, and the yield is increased greatly; the high-shear reactor is low in cost, and is easy to operate.