As the SU-8 cantilever integrated by a metal piezoresistance can achieve a very high force sensitive coefficient due to its low elastic modulus, this paper designs a new type of SU-8 cantilever micro-force sensor integrated by a serpent-shaped copper piezoresistive structure and fabricates a prototype with a double-layer cantilever by a novel processing method. It introduces the design principles and fabrication method for the micro-force sensors and measures its technological parameters.Experimental results show that the SU-8 micro-force sensor has good linearity range in 0-350 μN and its force sensitivity is 0.24 mV/μN and measuring error is 4.06%. It can implement the micro-force detection and has advantages of simpler production process and shorter cycle as compared with a silicon micro-force sensor. Moreover, the force sensor has potential application in biomedical research for the SU-8 with prominent biological compatibility.