The invention relates to an electric cabinet dehumidifier comprising a shell, and a condensing assembly, a heater, a control module, a temperature and humidity sensor and a fan which are arranged in the shell, wherein the condensing assembly, the heater, the temperature and humidity sensor and the fan are connected with the control module. The electric cabinet dehumidifier provided by the invention dehumidifies through the cooperation of a heating method and a condensing method so as to completely realize dehumidification and quickly solve the condensation problem, and prevents the secondary condensation problem through automatic control to effectively guarantee the safety problem caused by condensation of the electric equipment.