This paper presents a planar magnetic flux concentrator (MFC) for reducing the leakage flux and increasing the power transmission in the wireless power transfer (WPT) system. The magnetic field distribution in WPT and eddy current distribution in MFC are investigated. The Finite Element Method (FEM) based simulation results show that the magnetic flux density is increased around the centre hole area of the Tx and Rx coils and decreased in the outer area of the Tx and Rx coils. The experiment results demonstrate that the power transfer and magnetic coupling coefficient are increased by using a planar MFC in WPT system. The equivalent circuits of WPT transformer with and without a planar MFC are also proposed based on the impedance measurement and analysis.