The invention provides a construction method for controlling deformation of anchor piles at a
barrel segment of a tunnel. The construction method comprises the following steps of: dividing a section of a tunnel to be excavated into three parts, i.e. an upper step, a middle step and a lower step, firstly, excavating the part of the upper step to an in-depth M-meter position of the
barrel segment, and arranging supporting steel frames and locking anchor pipes, which are used fora primary support, at intervals; based on the upper step, excavating the part of the middle step to an in-depth N-meter position of the
barrel segment, and arranging the supporting steel frames and the locking anchor pipes, which are used for the primary support, at intervals; obliquely inserting reinforcing anchor pipes downwards into tunnel rock
mass of the barrel segment at the part of the middle step; based on the middle step, excavating the part of the lower step and arranging the supporting steel frames and the locking anchor pipes, which are used for the primary support, at intervals. Compared with the prior art, in the construction method for controlling deformation of the anchor piles at the barrel segment of the tunnel, which is provided by the invention, the longitudinal rigidity and
bearing capacity of the primary support are reinforced, integral sinking, deformation and fracture of a cavern primary
support system are controlled, and construction safety and tunneling efficiency of the tunnel are ensured.