Spray pump

A spray pump, comprising:

• a small piston and an upper pump rod, wherein a liquid accumulation cavity is formed between the small piston and the upper pump rod, the upper pump rod is provided with a liquid discharge hole which communicates with the liquid accumulation cavity, and the small piston is provided with a sealing column for sealing the liquid discharge hole;
• a central column with an ejector rod being provided on a lower part of the central column and extending into the liquid discharge hole, wherein a liquid flow gap is disposed between the ejector rod and the liquid discharge hole, a central hole which communicates with the liquid discharge hole is disposed at a central part of the central column;
• a press head fixed with the central column at a lower part of the press head, wherein an outer liquid discharge hole connected with the central hole is disposed at a central part of the press head;
• and
• a press plate fixed with the upper pump rod, wherein a press gap is disposed between an upper side of the press plate and a lower side of the press head;
• wherein when the press head moves down, the central column moves down synchronously with the press head, and the ejector rod of the central column pushes the small piston downward, wherein the small piston communicates with the upper pump rod, and the liquid accumulation cavity communicates with the outside.