Sterile spray pump

A sterile spray pump, comprising a main piston (30) configured to be connected to a container, a spray head (40) mounted in a vertically movable manner on the main piston (30), and a secondary piston (50) fixed inside the spray head (40), wherein the secondary piston (50) is mounted in a vertically movable manner on the main piston (30), and a first compression space (10) and a second compression space (20) are formed between the secondary piston (50) and the main piston (30);

• a main liquid suction cavity (301) communicating with the inner cavity of the container and an air supply port (302) communicating with the main liquid suction cavity (301) are provided in the main piston (30);
• the air supply port (302) communicates with the second compression space (20), and a filter element (601) covering the air supply port (302) is fixedly provided in the air supply port (302);
• the secondary piston (50) includes a secondary liquid suction cavity (501) communicating with the main liquid suction cavity (301), a first exhaust member (502), and a second exhaust member (503);
• when the spray head (40) is not pressed down, a space between the main piston (30) and the secondary piston (50) is sealed;
• after the spray head (40) is pressed down and the main piston (30) abuts against the first exhaust member (502) and the second exhaust member (503), the first compression space (10) communicates with the main liquid suction cavity (301) through the first exhaust member (502), and the second compression space (20) communicates with the exterior of the sterile spray pump through the second exhaust member (503).