The invention discloses a pesticide blending spray-head with spraying concentration controlled through a motor. The pesticide blending spray-head comprises a spray-head main body, a needle valve, a needle valve seat, a spray-head front cover and a pesticide liquor concentration control mechanism. A taper sealing part is formed between the needle valve and the needle valve seat. The front of the taper sealing part is provided with a front stoste channel and the rear of the taper sealing part is provided with a rear stoste channel. A pesticide blending chamber is formed between the spray-head front cover and the needle valve seat and communicated with the front stoste channel. A stoste hole communicated with the rear stoste channel is formed in the spray-head main body. The pesticide liquor concentration control mechanism comprises the motor arranged at the rear end of the spray-head main body and a transmission mechanism which connects a motor spindle and the rear end of the needle valve and pushes the needle valve to be in a rectilinear motion. A water inlet hole is formed in the spray-head main body. A water inlet channel communicating the water inlet hole and the pesticide blending chamber is arranged on the needle valve seat. According to the pesticide blending spray-head with the spraying concentration controlled through the motor, pesticide blending is completed automatically by the pesticide blending spray-head during the operation; in addition, the pesticide liquor concentration can be controlled by the pesticide blending spray-head, and adjusting measures to local conditions and precise spraying in a precision agriculture mode are achieved.