The invention relates to a rotating interferometer-based pulse signal direction finding method and apparatus. The direction finding method comprises the following steps a mathematical model for a rotating interferometer is built; according to the mathematical model, boundaries of pulse signal repetition rates is determined; whether pulse signals satisfy a boundary inequation of the pulse repetition rates is determined; if not, pulses are determined as low repetition rate pulses, low repetition rate pulse direction finding operation is performed; if yes, the pulses are determined as high repetition rate pulses, and high repetition rate pulse direction finding operation is performed. According to the method and apparatus disclosed in the invention, whether the pulse signals are low repetition pulses can be determined through calculation of the boundaries of the repetition rates of the discrete pulse signals; if yes, a fuzzy interval free set is calculated according to two preceding pulsesignals, elements in the fuzzy interval free set are screened according to succeeding pulse signals, high precision estimates of orientation and pitch angles can be obtained, and accuracy of direction finding results can be effectively improved.