The invention provides a method and a device for determining angle information of a formation boundary. The method comprises the steps of establishing a geologic model which comprises at least one formation boundary; arranging an observing system on the geologic model and extracting a shot interval and a demodulator probe interval in the observing system; performing grid dividing on the geologic model according to the shot interval and the demodulator probe interval, and obtaining preset number of grid models; and determining angle information which corresponds with the formation boundary according to the position relationship between the formation boundary and the grid models. The method and the device for determining the angle information of the formation boundary provided by an embodiment of the invention can quantitatively evaluate the imaging capability of the formation boundary by means of self angle information of the formation boundary.