The utility model provides an electrostatic grounding device, including elasticity bar copper, wire, grounding body, elasticity bar copper upper portion is the stiff end, and hold for flexible the lower part, the stiff end is the wire even, this wire other end connection grounding body, flexible end top is equipped with the rubber head. The utility model provides an electrostatic grounding device, static directly through elasticity bar copper, wire, the leading -in the earth of grounding body, reach the purpose of releasing. The scalable line of elasticity bar copper can realize according to the capacious minor tune -up oil filling riser of the tank car distance apart from tank wagon tank bottoms portion, has solved to make the oil filling riser too high apart from large capacity bottom tank wagon jar because of the oil filling riser height is fixed, produces the problem of a large amount of static easily on the oil surface. This tank wagon static electricity discharge device is direct to link to each other oil, oil filling riser head and the earth, has saved middle contact link, need not carry out resistance detection, has practiced thrift the cost greatly.