Droplet digital PCR chip

A droplet digital PCR chip, comprising:

• at least one chip unit, wherein each chip unit comprises a chip body formed by bonding a top piece and a bottom piece and the chip body is internally provided with an inlet chamber,
• a droplet storage chamber, and
• an injection hole, wherein the injection hole connects with the inlet chamber, a plurality of droplet generating channels are disposed between the inlet chamber and the droplet storage chamber, a height of each of the droplet generating channels is smaller than a height of the droplet storage chamber, an injection fluid is injected into the inlet chamber through the injection hole, and the injection fluid is emulsified and enters the droplet storage chamber at a junction of the droplet generating channels and the droplet storage chamber;
• wherein the droplet storage chamber is in a U-shaped structure, the inlet chamber is in a linear structure, the droplet storage chamber is divided into a left arm and a right arm, the left arm and the right arm are disposed on two sides of the chip respectively and the inlet chamber is disposed between the two arms of the U-shaped structure;
• wherein a plurality of droplet generating channels are disposed along two sides of the inlet chamber to increase a speed of droplet generation;
• wherein the injection hole connecting to the inlet chamber is disposed on a surface of the chip, an end of the inlet chamber close to the injection hole is an injection end, an arrangement density of the droplet generating channels gradually increases from the injection end to another end of the inlet chamber.