A tent assembly, comprising: a supporting frame comprising a top base; and multiple supporting rod units pivotally connected to and spacedly arranged around the top base, and each supporting rod unit comprising a top rod having a first end and a second end, the first end connected with the top base; a first joint connected with the second end of the top rod and having a first connecting rod connected with the second end of the top rod; a second connecting rod; and a pivotal center; a middle rod connected with the first joint; and a rainfly connected with the supporting frame and comprising multiple connection units connected with the supporting rod units, and each connection unit comprising multiple connection ropes spacedly arranged and connected with the top rod and the middle rod of one of the supporting rod units; characterized in that each supporting rod unit further comprising two hooks each having a first end and a second end, wherein the second ends of the hooks are respectively pivotally connected with the first connecting rod and the second connecting rod of the first joint at positions away from the pivotal center of the first joint; and at least one elastic belt mounted around the first ends of the hooks of a corresponding one of the supporting rod units. a supporting frame comprising a top base; and multiple supporting rod units pivotally connected to and spacedly arranged around the top base, and each supporting rod unit comprising a top rod having a first end and a second end, the first end connected with the top base; a first joint connected with the second end of the top rod and having a first connecting rod connected with the second end of the top rod; a second connecting rod; and a pivotal center; a middle rod connected with the first joint; and a rainfly connected with the supporting frame and comprising multiple connection units connected with the supporting rod units, and each connection unit comprising multiple connection ropes spacedly arranged and connected with the top rod and the middle rod of one of the supporting rod units; characterized in that each supporting rod unit further comprising two hooks each having a first end and a second end, wherein the second ends of the hooks are respectively pivotally connected with the first connecting rod and the second connecting rod of the first joint at positions away from the pivotal center of the first joint; and at least one elastic belt mounted around the first ends of the hooks of a corresponding one of the supporting rod units. a top base; and multiple supporting rod units pivotally connected to and spacedly arranged around the top base, and each supporting rod unit comprising a top rod having a first end and a second end, the first end connected with the top base; a first joint connected with the second end of the top rod and having a first connecting rod connected with the second end of the top rod; a second connecting rod; and a pivotal center; a middle rod connected with the first joint; and a rainfly connected with the supporting frame and comprising multiple connection units connected with the supporting rod units, and each connection unit comprising multiple connection ropes spacedly arranged and connected with the top rod and the middle rod of one of the supporting rod units; characterized in that each supporting rod unit further comprising two hooks each having a first end and a second end, wherein the second ends of the hooks are respectively pivotally connected with the first connecting rod and the second connecting rod of the first joint at positions away from the pivotal center of the first joint; and at least one elastic belt mounted around the first ends of the hooks of a corresponding one of the supporting rod units. a top rod having a first end and a second end, the first end connected with the top base; a first joint connected with the second end of the top rod and having a first connecting rod connected with the second end of the top rod; a second connecting rod; and a pivotal center; a first connecting rod connected with the second end of the top rod; a second connecting rod; and a pivotal center; a middle rod connected with the first joint; and a rainfly connected with the supporting frame and comprising multiple connection units connected with the supporting rod units, and each connection unit comprising multiple connection ropes spacedly arranged and connected with the top rod and the middle rod of one of the supporting rod units; characterized in that each supporting rod unit further comprising two hooks each having a first end and a second end, wherein the second ends of the hooks are respectively pivotally connected with the first connecting rod and the second connecting rod of the first joint at positions away from the pivotal center of the first joint; and at least one elastic belt mounted around the first ends of the hooks of a corresponding one of the supporting rod units.