The invention provides a valve bottom lining fluid-spraying device. The spraying device is arranged on one side of a ball valve on a water pipe and used for increasing the speed of waterflow in the position of the ball valve. The spraying device comprises a fixing mechanism and an air spraying mechanism. The fixing mechanism comprises a sealing pipe, a first sealing valve and a second sealing valve. The first sealing valve and the second sealing valve are arranged on the sealing pipe. A cavity in the sealing pipe is a mounting channel. The mounting channel is further connected with the air spraying mechanism. The air spraying mechanism comprises an air spraying pipe, a one-way air valve and an external air pump. The air spraying pipe is arranged outside the mounting channel inside the sealing pipe. The first sealing valve and the second sealing valve are clamped to the outer wall of the air spraying pipe. One end of the air spraying pipe extends into the water pipe. The other end of the air spraying pipe is connected to the external air pump. The one-way air valve is further arranged between the air spraying pipe and the external air pump. An included angle is further formed between the air spraying pipe and the water pipe. By means of the valve bottom lining fluid-spraying device, impurities deposited at the bottom of the ball valve on the water pipe can be effectively cleared, and the good opening-closing states of the ball valve are maintained.