Construction method for severe cold area off-site prefabricated part crack prevention

The invention discloses a construction method for severe cold area off-site prefabricated part crack prevention. The method comprises the following steps that a long-line pedestal is arranged according to a prefabricated part production line technology; prefabricated parts are manufactured on the long-line pedestal; a prefabricated concrete construction technology is improved, after concrete pouring of the prefabricated parts is completed, the concrete surface is twisted to be flat, and press polishing and leveling are performed three times according to time phases; part concrete surface heat preservation heating measures are made, wherein after prefabricated part concrete pouring is finished and press polishing and leveling are performed, the surface is covered with two layers of plastic films and then paved with a layer of blanket felt so as to prevent water on the surface of prefabricated part concrete from being evaporated; the long-line pedestal is arranged according to the prefabricated part production line technology, and a prefabricated part warm shed skeleton is erected by means of steel pipes; stoves are placed every ten meters inside a warm shed, and the average temperature inside the warm shed is increased by 10 DEG C. According to the construction method, the problem that quality defects are caused when irregular temperature cracks appear on the concrete surface due to the large temperature change on the negative temperature condition is solved.