The invention discloses a tunnel face stability calculation method taking seepage force into consideration. The method mainly comprises the following steps of (1) according to parameters such as a tunnel burial depth, an excavation size and the like, determining a geometric relation among the tunnel burial depth, the excavation size and a damage range; (2) according to a seepage balance equation and in combination with numerical simulation software, obtaining average seepage force in the damage range; (3) according to an energy conservation principle, obtaining a virtual support force expression of a tunnel face; and (4) reducing surrounding rock parameters in combination with a strength reduction method, so that virtual support force is zero, and a reduction coefficient at the moment is atunnel face stability coefficient. The method disclosed by the invention can be applied to the tunnel face stability analysis of underground building structures such as mining roadways, hydraulic tunnels, metros and the like during consideration of the action of the seepage force under the water level, and a reference is provided for support reinforcement of the tunnel face.