The invention provides a mass concrete stress dissipation crack control method. Dynamic stress is applied to mass concrete, unbalanced stress in the mass concrete is homogenized, concentration stress in the concrete is reduced, harmful stress is dissipated, and therefore generation of concrete cracks is effectively prevented and controlled; the mode in which the dynamic stress is applied to the mass concrete is characterized in that the dynamic stress is applied through an excitation hammer and/or the dynamic stress is generated through blast vibration and/or the dynamic stress is generated through alternating tension and compression stress generated due to low-frequency temperature rise and drop. According to the mass concrete stress dissipation crack control method capable of homogenizing and dissipating the harmful and unbalanced stress in the concrete, the problem of the concrete cracks can be solved, the stress concentration level in the concrete can be effectively reduced, the unbalanced stress is homogenized, and therefore concrete crack resistance is improved.