The invention discloses a method for reserving holes in a brick wall. The method comprises the following steps of manufacturing tubes of which the lengths are the same with the thickness of the wall and the diameters are the same with those of reserved holes according to requirements of a design paper; correspondingly numbering the manufactured tubes and the reserved holes; signing marks of the reserved holes at positions, perpendicular to the reserved holes, on the ground; calculating bottom elevation of the reserved holes; placing the corresponding numbered tube when the wall is built to the designed bottom elevation of the corresponding reserved hole and enabling two ends of the tube to be parallel and level with the wall; cutting off a brick; pressing the built wall along two sides of the tube until the wall is parallel and level with the top of the tube; covering the upper end of the tube by using a mortar layer; and continuing building the wall on the upper surface of the reserved hole after the mortar layer is solidified. The construction progress is fast, the cost is low, and the method is suitable for reserving holes in brick walls during construction of a building.