Micro-droplet generator

A micro-droplet generator, comprising:

• a main body, having an inside with a chamber accommodating liquid to be sprayed and a lateral opening allowing liquid in said chamber to flow out;
• a spraying plate, placed on said main body at said opening thereof and having a plurality of spraying holes in a dense arrangement as well as an inner side facing said chamber which contacts liquid in said chamber;
• a vibrating element, glued on said spraying plate and driving vibrations thereof;
• and
• a projection, placed inside said chamber and having an outer side touch with said inner side of said spraying plate;
• wherein a narrow space is left between said inner side of said spraying plate and said outer side of said projection, which upon said vibrations of said spraying plate has a varying width, upon becoming wider sucking in liquid from said chamber, and upon becoming narrower pressing out liquid through said spraying holes, so that effective spraying of liquid is performed.