Liquid injection device

The utility model discloses a liquid injection device which comprises a device bottom plate and further comprises a first fixing plate and a second fixing plate which are detachably arranged at the top end of the device bottom plate. The liquid injection mechanism is movably arranged between the first fixing plate and the second fixing plate and can inject the hydrogen peroxide solution used by a plurality of hydrogen peroxide low-temperature plasma sterilizers at the same time, the liquid injection mechanism comprises a motor, and one side of the motor is connected with a motor shaft. The movable block is driven by the threaded rod to move, so that the liquid injection plate can move at the bottom of the liquid injection head, the liquid injection head can inject a hydrogen peroxide solution into capsules in different capsule grooves in the movable liquid injection plate, the overall efficiency of injecting the hydrogen peroxide solution into the multiple capsules is improved, liquid injection can be rapidly