An LC sensing system, comprising a reading portion and a sensing portion, wherein the reading portion comprises a readout circuit (1) and a first inductor (2) connected in series to the readout circuit (1); the sensing portion comprises a second inductor (3), a cantilever switch (5) connected in series to the second inductor (3) by means of a rectifier circuit (4), and a parallel branch connected to both ends of the cantilever switch (5). The parallel branch comprises at least a first capacitive sensor (6) and a second capacitive sensor (7). The first inductor (2) and the second inductor (3) are inductively coupled to each other. In the LC sensing system, the deformation of the cantilever switch (5) is controlled, and on the basis of different deformation degrees and shape recovery characteristics of the cantilever switch (5) at different driving voltages, the first capacitive sensor (6) and then the second capacitive sensor (7) are connected in a circuit, so that passive wireless multi-parameter measurement is achieved, and the system is simple and easy to operate.