Disclosed is an energy-saving and environment-friendly double-row air duct heater, including a bottom plate and a shell. A motor and fan blades are arranged on one end in the shell. The upper part of the shell is provided with a control device. A heating component is arranged on the other end in the shell. An air inlet is formed at the rear end of the shell, and an air outlet is formed at the front end of the shell. The heating component includes an air volume drainage device. Two groups of electric heating pipes are arranged on both sides of the air volume drainage device. Each group of electric heating pipes is composed of a plurality of vertically arranged electric heating pipes. An air guiding passage is formed between two adjacent electric heating pipes.