A heating and fixing system for infusion into children comprises a support block, a support device, a jacking device, a fixing device, support bars, a pressing and leaning device, a drawing device and rotary devices, wherein a cavity, a first power supply, a first fixing rack, a second fixing rack, a first heating rod, a second heating rod, a first spongy cushion, a first support, a first backing plate and a second spongy cushion are arranged on the support block; the support device comprises a baseplate, a first support pillar, a first propping and leaning rod, a first cross rod and a second propping and leaning rod; the jacking device comprises a second support, a second backing plate and a third spongy cushion; the fixing device comprises a first fixing rod, a third support, a first revolving bar, a rotary part, a movable block and a propping and leaning rod; a rectangular hole is formed in each support bar, and a first vertical rod is arranged on each support bar; the pressing and leaning device comprises a triangular block, a fourth spongy cushion, a third heating rod and a movable rod. Through adoption of the heating and fixing system, an arm of a child can be effectively fixed to prevent the arm from moving around during infusion into the child; besides, the heating and fixing system has a heating function of promoting blood circulation of children.