The utility model discloses a novel pitch is prevented to oil tank device, it includes hull and oil tank, the oil tank sets up the top of hull, wherein, the inside of hull is equipped with a plurality of backup pads that are parallel to each other, the backup pad certainly the bottom of hull is vertical upwards to be extended to the top of hull, just the top of backup pad still is connected with a big end down's round platform shape arch, the bottom surface central point department of putting of oil tank is equipped with recess interior sunken earlier on, the recess with the arch cooperatees. The utility model discloses greatly increased the area of contact of protruding and recess, and then the displacement of restriction oil tank that can be better, the transmission that also can exert all one's strength simultaneously is more abundant, has reduced arch and the out -of -gear potential risk of recess. And a plurality of backup pads that are parallel to each other through the adoption support the arch simultaneously, make bellied intensity greatly increased to can be better resist the destruction of twising reverse the production because of the pitch.