The invention belongs to the crossing field of optical metamaterials and microwave electric field measurement, and particularly relates to a portable microwave electric field measuring device based onRydberg atoms. The portable microwave electric field measuring device comprises a first laser, a first optical fiber polarizer, a first optical fiber interface, a first GRIN lens, a second laser, a second optical fiber polarizer, a second optical fiber interface, a second GRIN lens, a metasurface structure, a photoelectric detector and a vacuum alkali metal atom air chamber. The portable microwave electric field measuring device has the advantages that the integration and miniaturization of the atom air chamber are realized; an all-dielectric material is used for design, so that the measurement precision is improved; during measurement, an optical path does not need to be adjusted, and an optical fiber is connected, so that the portable microwave electric field measuring device is very convenient to use, small in size, convenient to place and suitable for various complex environments; and the optical fiber is used for transmitting light, the limitation of the laser is eliminated, theportability of the atomic gas chamber is realized, and the practicability of the system is greatly improved.