A field detection device (Z11, Z12, ... Z1n, Z21, Z22, ... Z2n, ..., Zm1, Zm2, ... Zmn) and system for achieving no maintenance of a gas density relay. The field detection device comprises a temperature regulation mechanism (5) and an intelligent control unit (7), wherein the increase and decrease of the temperature of the temperature regulation mechanism (5) are controlled by the intelligent control unit (7), thereby enabling the temperature of a temperature compensation element of a gas density relay (1) to rise and fall to complete the field detection of the gas density relay (1), and no maintainer is needed to operate on site to achieve no maintenance of the gas density relay (1) and greatly improve the efficiency and reliable and safe running of power grids. Further provided is a field detection method for supporting normal running of the field detection device (Z11, Z12, ... Z1n, Z21, Z22, ... Z2n, ..., Zm1, Zm2, ... Zmn).
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