Injection device and injection system

The embodiment of the invention provides an injection device and an injection system, and belongs to the technical field of injectors, the injection device comprises a main channel, a first movable part, a first injection channel and a second injection channel, and the first injection channel and the second injection channel both extend in the first direction and are arranged in the second direction; the first spraying channel and the second spraying channel communicate with the main channel, and the first direction is different from the second direction. The first movable part is movably inserted into the first spraying channel and the second spraying channel in the second direction and used for achieving spraying of the first spraying channel or the second spraying channel. The opening sizes of the first spraying channel and the second spraying channel are different. Therefore, according to the injection device and the injection system provided by the embodiment of the invention, the flow velocity range of