Abstract: The present invention relates to a device for collecting body fluids, the device comprising: (a) an internal pressure adjustment means for adjusting the internal pressure of the device, and the internal pressure adjustment means has an internal space and is made of an elastic deformable material; (b) a fluid accommodation means, which is openly connected to the internal pressure adjustment means, for accommodating body fluids collected from the human body; and (c) a perforation means which is connected to the fluid accommodation means, is located at the lower part of the device, and comprises a hollow microstructure for forming an opening on the body.