In-situ injection device

The invention discloses an in-situ injection device. The in-situ injection device is connected with a screw rod pump of a stirring skid body through a reducing joint, the stirring skid body comprisesa stirring water box, a stirring shaft, a stirring motor, a rolling screen, a heating coil and a screw pump, wherein the rolling screen is located above the stirring water box, and a chemical is quantitatively conveyed into the stirring water box by rolling; the in-situ injection device comprises a first pipeline, a liquid separating tank and a plurality of second pipelines; the screw rod pump conveys the chemical liquid into the first pipeline, and the liquid chemical flows into the liquid separating tank from the first pipeline, and then flows into each second pipeline from the liquid separating tank, one end of the first pipeline is connected with the reducing joint, and the other end of the first pipeline is connected with the liquid separation tank, and the plurality of second pipelines are connected to the l