▎ 摘　　要

NOVELTY - The flow rate detection device has a substrate (1), a micro-flow channel layer (2) and a cover plate (3). The substrate is located at the bottom side of the micro-flow channel layer. The cover plate is located on the upper side of the micro-flow channel layer. The substrate is provided with a laser-induced graphene pattern. The laser-induced graphene pattern is located on the projection surface of the liquid channel of the micro-flow channel layer. The side of the liquid channel of the micro-channel layer that faces the laser induced graphene pattern is made of transparent material. The laser induced graphene pattern is directly generated on the substrate by carbon dioxide laser inducing method. The substrate material is polyimide, polyetherimide, leaves, wood, or other carbon source material capable of being ablated into graphene. USE - Flow rate detection device for flow rate liquid flow in micro-fluidic flow passage used in chemical, biological, medical analysis field. ADVANTAGE - The device provides a simple, wide universality and no damage to the sample liquid-flow control flow rate flow rate detection device and detection method. The manufacturing technology process is simple, is produced in large scale and does not introduce other impurities in the liquid to cause pollution of the sample which is good for integrating other analysis module. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for detecting a detection device of flow liquid in micro-fluidic flow passage. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view of the flow rate detection device for flow rate liquid flow in micro-fluidic flow passage. Substrate (1) Micro-flow channel layer (2) Cover plate (3) Liquid inlet (3-1) Liquid outlet (3-2)