The invention discloses a depth crack pouring construction method of asphalt pavement longitudinal crack, aiming at solving the existing problems of difficulty in effectively plugging cracks by adopting the crack pouring materials to perform crack pouring on the asphalt pavement longitudinal crack and larger capital investment, longer time in closing traffic and stronger influence on the service capability of roads caused by adopting the modes of mat coat digging and repairing, subgrade reinforcing and foundation grouting and the like. The construction method of the invention comprises the following steps: preprocessing a longitudinal crack, distributing holes and installing a fixed preset sleeve, preparing cement mortar with a certain fluidity and strength, adopting a certain pressure for grouting, cleaning the construction site, preserving construction section and opening traffic after the strength requirement is satisfied. The method of the invention has high crack pouring strengthand strong durability and lower material cost, short construction period, little traffic interference, is safe and environmental, can repair damaged basement layer, prevent the crack from being generated again, improve service level of the road and prolong the service life of the road.