The invention discloses a displacement governing method of a fracture plane of a rock slope. The displacement governing method comprises the following steps of taking out a softened interlayer from the fracture plane of the rock slope in a drilling manner, and enabling the taken-out softened interlayer to be replaced with cement mortar of which the intensive parameters are high. Through the adoption of the displacement governing method disclosed by the invention, the stability of a high and steep slope can be improved; and the displacement governing method has the characteristics of being short in construction cycle, low in economical investment, obvious in reinforcing effect, environmentally-friendly and the like, and has the attributes of disaster prevention and reduction.