The invention relates to an explosion-proof septic tank 3. According to the explosion-proof septic tank, vent holes (7) are formed in partition plates (5), above water through holes (6), of a septic tank (1), so that the problem that liquid manure is subjected to swelling overflow due to the fact that the water through holes (6) of the septic tank are easily blocked by sludge can be solved; in addition, wind cowls (8) are arranged above clearing and raking holes (4) of clearing and raking wells (10), thus, the wind cowls (8) can be pushed to rotate and air flow in the septic tank can be changed into bottom-up vertical air flow under the action of wind generated when the liquid manure rushes in the septic tank from a water inlet (2), thus, marsh gas in the septic tank can be upwards exhausted along the clearing and raking wells (10) through a plurality of ventilation holes with the diameter of 2cm or more in well covers (9), and then, the internal marsh gas concentration of the septic tank is lowered, so that the problem that people are injured by firedamp explosion of the septic tank can be effectively prevented; and the explosion-proof septic tank is simple in structure, good in use effect and extremely easy in popularization.