The invention belongs to the technical field of auxiliary equipment for petroleum geological exploration instruments and particularly relates to a high resolution oil-based mud electric imaging board.According to the high resolution oil-based mud electric imaging board, a composite signal containing two different frequency components is employed as a measurement signal, more button electrodes canbe distributed on a same-width pole board, the relevant algorithm can be employed to eliminate influence of oil film and other factors, the transverse resolution is greatly improved, and high definition borehole wall images can be acquired. The high resolution oil-based mud electric imaging board comprises the pole board, wherein two ends of the pole board are symmetrically provided with two backflow electrodes, the gap of the two backflow electrodes is further equipped with a button electrode array, periphery of the button electrode array is provided with screen flow electrodes, an internalchamber of the electrode board is equipped with a circuit board assembly, the circuit board assembly comprises an emission circuit, an amplitude ratio and phase difference measurement circuit and a control circuit, and the emission circuit is controlled by the control circuit and is used for sending the composite signal containing the two different frequency components to the button electrode array and the screen flow electrodes.