A dental filling resin comprising at least one resin unit, at least one filling unit, and at least one antibacterial unit is provided. The structure of the resin unit is shown as formula I: n is 0-0.07； R1 is a first substituent having an acrylic functional group. The filling unit has at least a second substituent having an acrylic functional group. The antibacterial unit has at least a third substituent having an acrylic functional group. Wherein the first substituent of the resin unit, the second substituent of the filling unit, and the third substituent of the antibacterial unit are cross-linked.一種牙科填補樹脂，包含至少一樹脂單元，其結構如式I所示：(I)，n為0~0.07，R1為具有壓克力官能基之一第一取代基；至少一填充單元，具有至少一第二取代基，該第二取代基具有壓克力官能基；以及至少一抗菌單元，具有至少一第三取代基，該第三取代基具有壓克力官能基，其中，該樹脂單元之該第一取代基、該填充單元之該第二取代基以及該抗菌單元之該第三取代基三者彼此交聯共聚。
