The utility model relates to a continuous injector. The excircle surface of the scale sleeve pipe of the continuous injector is provided with a main scale and a complementary scale. The excircle surface of the adjusting thread insert is provided with an adjusting scale; a physic liquor injection connection device contains a bottle inserting needle and a bottle inserting seat; the bottle inserting needle is fixed in the bottle inserting seat; the bottle inserting needle is provided with an air inlet hole and a liquid outlet hole; the lateral surface of the bottle inserting needle is provided with a nonreturn valve communicated with the atmosphere. While in use, the coarse adjustment and the micro adjustment can be carried out as long as the adjust thread insert is rotated; the quantitation is more accurate, the operation is simpler and the connection is convenient; one end of the physic liquor feeding device is connected with a handgrip, and the bottle inserting needle of the other end of the physic liquor injection device is inserted in the