The utility model relates to a horizontal earthing LPG pressure vessel, include: the jar body, its barrel of placing for the level, the head, it locates a jar body both ends, the air chamber, it locates a jar body top, and the air chamber top is equipped with inlet, a drain, temperature detecting element mouth, the 2nd drain, thing position index gauge mouth, liquid level meter port, pressure transmitter mouth and thermometer mouth, and the air chamber is equipped with the stiffening plate with jar junction of the body, the manhole, it locates a jar body top, the inner tank vertical ladder, itstretches into a jar internal portion through the manhole, the liquid outlet, it locates a jar body bottom, the drain is taken over, and it locates a jar body bottom, reinforcing ring, it is locatedon jar internal wall. The beneficial effect of the utility model: the utility model provides a volume is 3000m3's horizontal earthing LPG pressure vessel, and mechanical properties is good, stabilityis good, the feed liquor is strong with the maneuverability who goes out liquid, it is little influenced by external environment temperature, can realize the monitoring of temperature, liquid level, pressure etc.