PAM conductive hydrogels were prepared by free radical polymerization using acrylamide (AM) as the main material, MBAA as cross-linker and NaCl as conductive component. The effects of crosslinker content on mechanical and conductivity properties of the hydrogel network were investigated in detail. The mechanical properties and electrical conductivity were studied by universal tensile machine, and electrochemical workstation respectively. It was found that with the increase of MBAA, the elongation at break and conductivity of the hydrogels was decreased as a result, while recovery performance was improved. When being assembled as flexible sensors, the prepared hydrogel displayed good sensing capacity with a gauge factor of 1.76 at a strain of 100%. Furthermore, the sensors were able to successfully detect the human motions such as finger bending and knee movements, which demonstrates that the conductive hydrogel holds great potential in human healthcare applications.