In　this　paper,　we　report　a　novel　hermetically　sealed　and　precisely　temperature-controlled　growth　system　that　grows　MAPbI3　single　crystals　up　to　a　size　of　60　x　48　x　22　mm3.　The　grown　crystals　have　lower　defects　and　higher　quality.　It　is　expected　to　facilitate　the　commercialization　of　perovskite　single　crystals　for　optoelectronic　applications.