The invention discloses a roadway smooth blasting method. The method includes the following steps that A, a plurality of rows of first slotted holes are dug on a construction surface, the multiple rows of the first slotted holes are formed by using the axis of the construction surface as the direction, and every two adjacent rows of the first slotted holes are formed in a staggered mode; B, a plurality of second slotted holes are dug in the outer sides of the first slotted holes; C, the first slotted holes are filled with explosives, and by using the axis of the construction surface as the axis of symmetry, the explosives filled in the first slotted holes in the two sides of the axis of the construction surface meet the requirement of a normal distribution mode; and D, a stage delayed detonation mode is used for performing blasting construction. By the adoption of the roadway smooth blasting method, the defects in the prior art can be overcome, and control accuracy of the blasting surface is improved.