The invention discloses a severe cold area concrete expansion joint hydration course guaranteeing method in the field of civil engineering. The method comprises the following steps that 1, concrete suitable for a severe cold area with the temperature condition that daily temperature is lower than 4 DEG C is prepared and mixed; 2, a concrete transporting truck provided with a heat insulation sleeveis used for transporting the severe cold area concrete mixed in the step 1 to a construction position and casting and vibratory compaction are performed; 3, the cast concrete is cured, and the hydration course is monitored; 4, curing is gradually removed, and it is needed that the temperature drop within 24 hours is smaller than 20 DEG C in the removal process. The smooth concrete hydration course in the severe cold area concrete expansion joint construction process is guaranteed through the above several steps, and prepared concrete expansion joints can also have good bearing capability andlong service life while quick traffic opening is achieved.