Disclosed is an environment-friendly acoustic panel for building, including an acoustic panel which includes a first positioning groove and a second positioning groove, a positioning cylinder with open top and bottom ends being arranged in the first positioning groove in a length direction of the first positioning groove, the positioning cylinder being provided with an opening in an outer side wall of the first positioning groove, and a fixing block being arranged in the second positioning groove; two sets of sealing assemblies, the sealing assembly including an accommodating groove, a bottom portion of the accommodating groove being provided with a plurality of springs at intervals up and down, end portions of the plurality of springs are jointly connected with a positioning plate, and a surface of the positioning plate facing away from the springs being fixedly provided with a sealing block.