The invention relates to the field of formaldehyde removal in interior decoration, and discloses a method for preventing and controlling formaldehyde pollution in decoration engineering. The method comprises the following steps: 1, adding a formaldehyde stabilizer to a decoration auxiliary material, and performing stirring to achieve uniformity before construction, wherein the decoration auxiliarymaterial is a coating and/or an adhesive; 2, spraying a formaldehyde blocking agent on the exposed surfaces or the cut and notched surfaces of wood products used in the decoration during the construction, wherein the formaldehyde blocking agent is used for blocking the release of formaldehyde in the wood products; and 3, detecting and calculating the total release amount of formaldehyde in rooms,and spraying a formaldehyde cracking agent in the rooms after the construction. Different formaldehyde prevention and control technologies are used to prevent and control the indoor formaldehyde content at different stages in the decoration process, so the method reduces the superposed release of formaldehyde, effectively decomposes and converts a tiny amount of the residual released formaldehydefor a long term, and ensures that the decorated house after is safe and environmentally friendly and is suitable for people to live.