Magnetic resonance coupling wireless power transmission technology enables power transmission by highfrequency magnetic resonance coupling efficiently and in long distance. Mutual coupling coefficient between coils transceiver affects the transmission efficiency and the transmission distance of the system directly. Space field strength synchronous detection is the most direct way to accurately analyze mutual coupling coefficient. In this paper, a spatial distribution of the magnetic field detection system has been designed based on Visual Instrument. The design of a digitized magnetic field sensor based on Faraday's law of electromagnetic induction has been introduced in detail, as well as the design of a sensor array, the communication protocol between the upper computer and the lower computer ,and the software for the upper computer.The experimental results showed that the detection system has more than 10 MHz bandwidth. The sensitivity of the magnetic field sensor is 530 V/T probably. What’ more, the system has the function of multipoint synchronous acquisition. The platform can satisfy the requirements for magnetic field detection in magnetic resonance coupling wireless power transmission system.