The invention discloses a method for manufacturing mattresses. The method includes steps of (1), adding lavender powder into natural latex solution to obtain materials A; (2), adding poria powder andrhizoma atractylodis macrocephalae powder into natural latex solution to obtain materials B; (3), adding activated carbon particles into natural latex solution to obtain materials C; (4), placing thematerials A, the materials B and the materials C into molds and carrying out thermal steaming. The method has the advantages that the lavender powder is added into natural latex, and accordingly effects of calming nerves and promoting sleep can be realized when the mattresses are used; effects of removing damp can be realized by the poria powder and rhizoma atractylodis macrocephalae, peculiar smell can be absorbed by the activated carbon particles, and accordingly fresh smell of the mattresses can be kept.