The invention discloses an analytic method for adjacent well distance scanning. The analytic method comprises the following steps: acquiring trajectory data of a reference well and a comparison well, and unifying north directions and coordinate systems of the reference well and the comparison well; determining computation ranges of the reference well and the comparison well according to actual requirements, inserting a reference point P onto the reference well according to a scanning interval, and computing a trajectory parameter thereof; computing a minimal distance between the reference point P and any one well section on the comparison well, selecting a minimum in the minimal distances as a closest distance between the reference point P and the comparison well, and obtaining a comparison point Q corresponding to the closest distance; computing a parameter of a relative position relationship according to the trajectory data of the reference point P and the comparison point Q, and outputting a computation result chart according to a well depth sequence of the reference point P. According to the analytic method, the problems that adjacent well anti-collision danger points may be omitted and the like in a conventional closest distance scanning technology are solved. The analytic method has the advantages of accurate computation result, small computation quantity and the like.