The invention discloses a fireproof filter device for tail gas of an underground loader, comprising a box body arranged at one side of the tail portion of the whole machine and a middle partition plate fixed at the middle position in the box body. The box body is divided into an air inlet cavity and an air outlet cavity by the middle partition plate, gaps are reserved between the middle partition plate and the top of the box body as well as between the middle partition plate and the bottom of the box body so as to enable the air inlet cavity and the air outlet cavity to be respectively communicated, and alkali filter liquor is arranged in the box body. An air inlet pipe is inserted from the upper part of the air inlet cavity of the box body, the air inlet pipe is inserted below the liquid level of the alkali liquor, an air exhaust pipe communicated with the air outlet cavity is connected above the air outlet cavity of the box body, and a plurality of partition plates are respectively and sequentially arranged on the inner wall of the box body and the middle partition plate above the alkali filter liquor in the box body in a stagger way so as to form a maze type air channel. The fireproof filter device for the tail gas of the underground loader has the beneficial effects that the air outlet pipe can be effectively prevented from ejecting out liquor for filtering, as the fireproof filter device is of a single box body structure, the manufacturing difficulty and the cost are reduced.