In order to realize the reconstruction of the sound field in a moving medium, such as the sound field radiated by structural parts in acoustic wind tunnel applications, nearfield acoustic holography (NAH) in a moving medium has been proposed. In fact, this technique is also applicable to the reconstruction of sound field radiated by moving sound sources, such as automobiles and high-speed trains in cruising, as long as hologram surface moves synchronously with the sound sources. Currently, as for the proposed methods of NAH in a moving medium, the half-space problem has not been considered, and thus the sound field in a moving medium over a reflecting plane cannot be reconstructed accurately due to the influence of reflection. To resolve this problem, a method for sound field reconstruction in a moving medium over a reflecting plane is proposed based on equivalent source method, expanding the application range of NAH in a moving medium. Numerical simulations are conducted to verify the correctness and effectiveness of the proposed method, and the results show that the proposed method can eliminate the influence of reflection and achieve accurate reconstruction of sound field in a moving medium over a reflecting plane.