The utility model relates to a frequency conversion energy-saving device for feed. The frequency converter is used for outputting corresponding variable-frequency current according to specific operation conditions of a motor, an air compressor and heating/cooling equipment for feed production, and is characterized by comprising a shell, a signal receiver, a torque test module, a pressure test module, a temperature test module, a processing module, a frequency converter and an output interface. Compared with the prior art, stepless speed regulation is carried out by regulating the rotating speed of the motor through the frequency conversion device, immediate dynamic regulation can be carried out according to the energy consumption demand condition, energy is saved, consumption is reduced, no-load power consumption is reduced, the service life of equipment is prolonged, the production cost is reduced, meanwhile, excessive cooling is avoided, material moisture is reasonably controlled, and the feed product quality is remarkably improved.