To realize multidimensional wireless power transmission （WPT） of the gastrointestinal capsule robot （CR） and reduce the winding dimension， volume， and heat production of the receiving coil， a novel structure of double dimensional orthogonal rectangular solenoid pair transmitting coil was designed. The direction of the synthesized magnetic field was changed by controlling the currents of different groups of transmitting coils. In addition， the magnetic core was embedded in the transmitting coils of the structure. The distance between the coils was adjusted flexibly according to the size of the detector to reduce the power loss. In this study， a theoretical model of the constructed WPT system was established， and then a finite-element simulation was performed to verify the improvement in the system performance due to the magnetic core. Finally， an experimental platform was set up for testing， and the parameters of the one-dimensional receiving coil were optimized. Furthermore， the feasibility of the system under different transmitting-coil spacings was experimentally verified. The experimental results indicate that when the on-line diameter is 0.05 mm， the optimal number of coils wound is 12， and the optimized number of turns is 120. When the transmitting voltage is 15 V and the transmitting-coil spacing is 300 mm， the minimum receiving power of the center is 1 578 mW， and the energy transmission efficiency is 3.85%. The system can meet the power requirements of the capsule robot with a transmitting-coil spacing in the range of 300-500 mm.