The invention provides low-VOC environmentally friendly nail-free glue, particularly low-VOC environmentally friendly nail-free glue used for home decoration and a preparing method thereof. Raw materials include 60-85 parts of silane modified polyether, 35-70 parts of a plasticizer, 60-90 parts of a filler, 0.1-3 parts of a catalyst and 2-25 parts of modified calixarene. The glue is green, free ofisocyanate, good in initial adhesive force, high in strength and durable. A calix[8]arene derivative is adopted in the formula so that heat resistance is good. The calix[8]arene derivative has largehollow cavity so that a requirement of high-degree seepage proofing can be met. After curing, the calix[8]arene derivative can freely move in a network structure, thus significantly increasing elasticity. In addition, the calix[8]arene derivative intertwines with the silane modified polyether so that an effect of instant adhesion can be achieved.