The present invention discloses a combination coal tunnel kiln furnace for reducing emission and consumption and eliminating smoke and dust, and the tunnel kiln comprises a tunnel kiln body. The tunnel kiln is a sealing channel whose inner is positioned with workpieces. The present invention is characterized in that a plurality of reciprocating type automatic coal feeding mechanisms are symmetrically arranged at the both sides of the tunnel kiln body, the reciprocating type automatic coal feeding mechanism comprises a reciprocating transmission beam, a roller and a plurality of fire grates, the reciprocating transmission beam is arranged on the roller, wherein each fire grate comprises a plurality of moving fire grates and a plurality of fixed fire grates, the moving fire grates are sideling arranged on the reciprocating transmission beam through flexible connecting axles, the fixed fire grates are arranged on the tunnel kiln body, wherein the moving fire grates and the fixed fire grates are arranged in a spaced way, and each back of fire gratecontacts with the end of the adjacent fire grate in a sliding way to form a coal storing place; a coaling hopper is arranged at the end of the reciprocating type automatic coal feeding mechanism, a combustion chamber and a flame channel are arranged at the upper part of the coaling hopper, and the combustion chamber and the flame channelencircle the kiln body.