The present invention relates to a cast-in-place wall construction method comprising the steps of: determining the wall line; forming kicker along the determined wall line; providing at least one of heat protection material or sound protection material or water protection material inside the formwork; installing the formwork along the wall line such that there is a gap between the two panels of the formwork or a gap between one panel of the formwork and a rigid body located on the opposite side of said panel; filling the mortar into the gap of the formwork; leaving said mortar to harden and to cure within the formwork; and removing the formwork. According to the invention, the filling of mortar into the gap of the formwork is carried out by positioning an end of at least one mortar filling tube above the slurry surface level at which the mortar is to be filled, with at least one mortar filling tube being moved vertically or horizontally or with at least one mortar filling tube being moved both vertically and horizontally in a relative manner.