Under the extreme environment in high altitude areas, cracks are prone to develop in the process of concrete pouring and curing, which affects the engineering quality and safe operation of the structure. In this paper, the ring method concrete restricted shrinkage cracking test is carried out, the effects of different temperatures (-5, 10, 25, 40 ℃) and humidity (50%, 65%, 80%) on the early restricted shrinkage cracking of concrete are studied to reveal the mechanism of concrete cracking at the early stage. The results show that the compressive strength and elastic modulus of early concrete increase with the increase of curing temperature and humidity, and the increase of compressive strength with curing age is more obvious than that of elastic modulus; with the decrease of curing temperature or increase of curing humidity, the drying shrinkage and self-shrinkage of concrete is reduced, which in turn would reduce the internal stress of concrete and improve its cracking resistance; the prediction model of early restricted shrinkage cracking of concrete is proposed, with which the time of restricted shrinkage cracking of early concrete can be accurately predicted. The findings can provide basic data support for the development of concrete cracking control technology.