The invention discloses an excavation construction technology for an expressway tunnel barrel. The excavation construction technology includes an excavation construction process of a V-class surrounding rock section, an emergency stop area excavation construction process of the V-class surrounding rock section, an excavation construction process of an IV-class surrounding rock section, an emergency stop area excavation construction process of the IV-class surrounding rock section, an excavation construction process of an III-class surrounding rock section and an emergency stop area excavationconstruction process of the III-class surrounding rock section. The excavation construction process of the V-class surrounding rock section adopts a circular excavation core earth remaining method forconstruction, the emergency stop area excavation construction process of the V-class surrounding rock section adopts a CD method for construction, the excavation construction process of the IV-classsurrounding rock section adopts a step method or a short step method for excavation, the emergency stop area excavation construction process of the IV-class surrounding rock section adopts a three-step method for excavation, the excavation construction process of the III-class surrounding rock section adopts full cross-section excavation, and the emergency stop area excavation construction processof the III-class surrounding rock section adopts the step method for excavation. The excavation and construction technology for the tunnel barrel can shorten the construction period, have small disturbance to surrounding rock, and is safe and reliable.