Drag type oil injector

The utility model discloses a drag type oil injector, which comprises an oil injection device, wherein an upper cover is arranged on an upper part of the oil injection device, a lower cover is arranged on a lower part of the oil injection device; and the upper cover, the lower cover and the oil injection device are mutually connected in a sealing way and form a sealed oil storage cavity. The drag type oil injector adopting the technical scheme has the advantages that: the capacity of the oil injector is 1000ml, which is 5 times larger than common capacity, and can generally meet the requirement of lubrication of one shift, so that an operator has no need to oil frequently, and the working efficiency is improved; the drag type oil injector is made of full-steel materials and has strong fracture resistance; a multiple-way oil supplying function can be realized; and the oil injector can be put on a ground so as to be dragged at will, so that the weight of a rock drilling machine is lightened, and the working burden of the operator is reduced.