The utility model discloses a spraying building concealed irregular middle wall combined type multiple-arch tunnel lining structure, relates to construction facilities for multiple-arch tunnels in railway, highway, subway or municipal administration and particularly relates to engineering facilities such as long tunnels and municipal tunnels which are high in requirement for construction speed. A multiple-arc structure is formed by a primary support structure and a secondary lining structure and the secondary lining structure is arranged on an inner layer of the primary supporting structure. The spraying building concealed irregular middle wall combined type multiple-arch tunnel lining structure is characterized in that a lining steel frame is arranged between the multiple-arc structure and steel fiber reinforced concrete sprays on the external surface of the lining steel frame to form into the spraying building concealed irregular middle wall. The spraying building concealed irregular middle wall combined type multiple-arch tunnel lining structure has the advantages of being strong in intensity, stiffness and toughness due to the facts that the irregular structured middle wall with the spraying building steel fiber concrete and the profile steel frame is adopted and rock pillar protection is reserved in rear holes during construction, bearing large surrounding rock load, guaranteeing integral stability and the structure safety of the middle wall during the construction and reducing stiffness mutation due to the fact that the structure is smoothly connected with the primary support.