The invention relates to an integrated microfluid reactor comprising an upper sealing plate (1) and a lower sealing plate (7); the reactor is characterized in that the upper sealing plate (1) and the lower sealing plate (7) are at least provided with a mixer base plate (2) and a functional base plate (4); the upper sealing plate (1) is at least provided with an discharging opening (12) and two microfliud feed openings (11), (13); the invention is a microscale chemical and industrial mechanical system which can carry out mixing mass transfer, chemical reaction and mixing and cooling, especiallyan integrated microfluid reactor integrating heating, reaction and various mixing modes. The integrated microfluid reactor can be used as a chemical reaction heat absorbing device and a chemical reaction heat discharging device simultaneously and has the advantages of simple structure, convenient manufacturing and processing and low cost.