A dynamic mixer head has a connecting cover, a rotor and a housing. The connecting cover has a rotor opening. The rotor has a first rotor axle mounted in the rotor opening and a mixing rotor connected with the first rotor axle. The mixing rotor has multiple vaned inner rotors with quarter-circle shaped multiple vanes and a vaned front rotor opposite to a second rotor axle of the mixing rotor with multiple vanes complementary to the multiple vanes of the multiple vaned inner rotors. The housing mounted to the connecting cover has at least two grooves disposed on the circular partition. Each of the at least two grooves has a spacer along each of the at least two grooves. The dynamic mixer head can enhance the mixing effect of two different component substances during rotation.