The invention discloses a processing device and technology for agricultural irrigation water sequence. The processing device comprises a body housing. A water input pipe and a water output pipe are arranged at the front and back parts of the body housing respectively. The processing device also comprises a first processing core pipe and a second processing core pipe in series connection with the rear part of the first processing core pipe installed inside the body housing. The first processing core pipe and the second processing core pipe are arranged to be biological energy filtering core pipes. The head of the first processing core pipe is connected with the water input pipe. The tail part of the second processing core pipe is connected with the water output pipe. A three-way valve is arranged at the water input pipe. A water output valve is arranged at the water output pipe. A backwashing pipe is communicated between the three-way valve and the water output valve. A blow-down valve is arranged between the three-way valve and the water input valve. Improvement of the soil environment can be assisted, reduction of plant diseases and insect pests can be assisted, absorption of nutrients in biological energy acting water carry soil for plants can be promoted, the mouthfeel and quality of agricultural products are raised, and fresh-keeping time of agricultural products is prolonged.