An LED illumination apparatus includes a shell, a fixing module, and at least one LED module fixed in the shell by the fixing module, wherein the fixing module includes a fastening piece and a tenon fixing respectively the two ends of the at least one LED module. The fastening piece includes a base fixed on the shell and a locking arm connecting to the base, and one end of the at least one LED module is fixed by one free end of the locking arm attached to the base.