The application relates to a method and system for detecting an environmental value. The method for detecting the environmental value comprises the following steps: during a preset detection period, amain intelligent terminal receives a first environmental value obtained by a mobile terminal; during the preset detection period, the main intelligent terminal receives a second environmental value obtained by at least one auxiliary intelligent terminal; during the preset detection period, the main intelligent terminal obtains a third environmental value; and the main intelligent terminal performs compensation calculation on the third environment value based on the first environment value and the second environment value, so as to obtain an actual environmental value detected by the main intelligent terminal during the preset detection time period. According to the method for detecting the environmental value, through setting the removable mobile terminal and the auxiliary intelligent terminals in a fixed position to perform compensation detection on the main intelligent terminal, the error between the environmental value detected by the main intelligent terminal and the real environment value is reduced to a certain extent, which provides parameters for the rational operation of the main intelligent terminal, and improves the user experience.