Frequency converter heat dissipation device suitable for extremely cold environment

The invention provides a frequency converter heat dissipation device suitable for an extremely cold environment. The frequency converter heat dissipation device comprises a box body, a frequency converter movement substrate unit, a main contactor, an auxiliary preheating assembly, an intelligent temperature control system, a frequency converter and multiple temperature sensors in a cavity, wherein the interior of the box body is divided into an inner cavity and an outer cavity by the frequency converter movement substrate unit; the frequency converter movement is located in the inner cavity and installed on a substrate of the frequency converter movement substrate unit; the auxiliary preheating assembly is located in the inner cavity and heats the inner cavity; the inner cavity temperature sensor is installed in the inner cavity and used for collecting the temperature in the inner cavity and transmitting inner cavity temperature data to the intelligent temperature control system; when the temperature data of