The invention discloses a portable soil permeability determining device and a measuring method using same. The portable soil permeability determining device comprises a mechanical auxiliary installingmechanism, an iron soldering type sensor probe and a control mechanism, wherein the mechanical auxiliary installing mechanism is symmetrically and divergently provided with a plurality of telescopicmechanical arms from the center to outside; a plurality of fixed sleeves are equidistantly arranged on the mechanical arms; the fixed sleeves in the same corresponding position of each mechanical armare located on a concentric circle; the iron soldering type sensor probe is longitudinally arranged in the fixed sleeves and is downwards inserted into to-be-detected soil at a certain distance; the iron soldering type sensor probe is internally and longitudinally provided with a plurality of humidity sensors at intervals; the control mechanism is respectively in communication connection with thehumidity sensors and remote monitoring equipment. The portable soil permeability determining device disclosed by the invention adopts a modular design, has a Wifi (Wireless Fidelity) wireless networkcommunication function, is capable of realizing a micro-irrigation system by matching with a micro-irrigation spray head and remedying the blank of existing like products in China, and is beneficial for reducing staff and increasing the working efficiency.