Multi-phase underground injector

The invention discloses a multi-phase underground injector, which belongs to the technical field of underground tools of petroleum drilling, and is a multipurpose tool capable of blocking underground leakage and strengthening a well wall. An axial through hole is formed in the center of a transmitting tube; one end of the transmitting tube is connected with an ellipsoidal guide head; at least twogroups of seat holes are distributed along the length direction of the transmitting tube; each group of seat holes is provided with at least two axially and symmetrically distributed seat holes; the inner end of each seat hole is communicated with the axial through hole; an injection cylinder is arranged in each seat hole through a base; and an ammunition cavity is formed between the base and theseat hole. The multi-phase underground injector has a simple structure and is convenient to operate, glue solution is injected to block the leakage passage in a stratum, extrusion force and shearing force are applied to rock so as to reduce or eliminate a crack, the wall can be strengthened quickly and effectively, the effect is good, the leakage accident can be effectively prevented, and the underground safety can be guaranteed.