The invention discloses a pneumatic conveying pipeline non-return intake valve which comprises a discharge pipe connector, a flow equalizing gas chamber, a feeding pipe connector and an intake pipe. The discharge pipe connector and the feeding pipe connector are located at the upper end and the lower end of the flow equalizing gas chamber correspondingly, the intake pipe is located on the side face of the flow equalizing gas chamber and communicates with the flow equalizing gas chamber, the upper end of the feeding pipe connector penetrates through the flow equalizing gas chamber and then stretches into the discharge pipe connector, the upper end of the feeding pipe connector is sleeved with a pipe-shaped sealing ring, and the upper end of the pipe-shaped sealing ring is provided with a horn-shaped opening and makes contact with the inner wall of the discharge pipe connector. The non-return effect is achieved through the elastic sealing ring with the horn-shaped opening, the horn-shaped opening is contracted inwards through pressure of airflow, and an annular air flue is formed by the gap between the horn-shaped opening and the inner wall of the discharge pipe connector. When air feeding is stopped, the horn-shaped opening recovers the original shape through self elasticity, the horn-shaped opening is tightly attached to the inner wall of the discharge pipe connector, and therefore materials are prevented from entering the flow equalizing gas chamber.