The invention relates to a tunnel departure and reception construction method, in particular to a construction method for departure and reception of an advanced small conduit in a rock tunnel. The construction method comprises the steps of driving and tunneling the small conduit into a stable rock stratum in the front along a tunnel excavation contour line before the tunnel is excavated, and welding the tail end of the small conduit onto a steel arch frame, and carrying out grouting on the small conduit, wherein a slurry penetrates into rock cracks via holes of the small conduit, the cement slurry solidifies the fractured rock mass, and the small conduit plays a certain supporting effect on the rock mass, thereby effectively restraining the surrounding rock from collapsing after excavation. The construction method has the advantages of conforming to the construction principle of a new Austrian tunneling method, fully protecting the rock mass, reducing disturbance to the rock mass, avoiding excessive damage to the strength of the rock mass, giving full play to the self-stabilizing capability of the surrounding rock, improving the construction efficiency, accelerating construction progress, decreasing investment in construction machinery, and saving construction costs.