Wireless power transmission is a popular technology. This paper focuses on the problems of magnetic leakage in wireless power transmission systems, the loss of magnetic field energy and the decrease in efficiency. In this paper, a kind of primary coil of conical structure was proposed and a hardware experimental platform was set up. The primary coil of the system uses the ordinary planar coil and the new conical coil respectively to take the control experiments with different frequencies and different distances. Experimental results show that the conical coil can improve the transmission efficiency of the wireless power transmission compared with the ordinary planar coil. Under the same condition, when the primary coil adopts conical coil, transmission efficiency of the system can increase 10%. In order to prove that the conical coil has the function of magnetism gathering, this paper uses Maxwell software to simulate the magnetic field between planar coil and conical coil. It is concluded that the conical coil is superior to the planar coil in terms of transmission energy density and distance. Conical coil can also gather magnetic energy effectively to reduce the occurrence of magnetism leakage and transmit a longer distance. The conical coil proposed by this paper provides the direction for subsequent research.