A filtering and concentrating apparatus having a stirring function for small ternary precursor particles, comprising a barrel, wherein one end of the barrel is provided with a first closure, and the other end of the barrel is provided with a second closure; the barrel or the first closure or the second closure is provided with a feed port; two discharge pipes are provided on the inner wall of the barrel; microporous filtering mediums communicated with the interior of the discharge pipe are provided on the discharge pipe; an end portion of the discharge pipe is communicated with the exterior of the barrel; wherein the discharge pipe is composed of one or more annular pipes, the annular pipe is provided with a plurality of mounting holes, and the microporous filtering mediums are connected with the mounting holes; and a stirring means is provided inside the barrel; wherein the stirring means comprises a stirring shaft; the stirring shaft is provided with three layers of stirring paddles; the lengths of the stirring paddles in the three layers of stirring paddles are identical; or the lengths of the stirring paddles in the three layers of stirring paddles are decreased progressively in the direction from the second closure to the first closure; wherein two discharge pipes are a first discharge pipe and a second discharge pipe respectively; a microporous filtering medium at the first discharge pipe is a first microporous filtering medium, and a microporous filtering medium at the second discharge pipe is a second microporous filtering medium; and the three layers of stirring paddles are respectively located above the first microporous filtering medium, above the second microporous filtering medium and below the second microporous filtering medium; wherein a liquid outlet valve is arranged on a pipeline connected with the end portion of the discharge pipe; the liquid outlet valve is connected with a filtrate outlet pipe; and the filtrate outlet pipe is provided with a first regulating valve; wherein a remote turbidimeter is arranged on the position of the filtrate outlet pipe near the liquid outlet valve, and the filtrate outlet pipe between the remote turbidimeter and the first regulating valve is provided with a remote filtrate flowmeter; the filtrate outlet pipe between the remote turbidimeter and the remote filtrate flowmeter is provided with an initial filtrate return valve, and the initial filtrate return valve is connected with a reactor through a pipeline. wherein the discharge pipe is composed of one or more annular pipes, the annular pipe is provided with a plurality of mounting holes, and the microporous filtering mediums are connected with the mounting holes; and a stirring means is provided inside the barrel; wherein the stirring means comprises a stirring shaft; the stirring shaft is provided with three layers of stirring paddles; the lengths of the stirring paddles in the three layers of stirring paddles are identical; or the lengths of the stirring paddles in the three layers of stirring paddles are decreased progressively in the direction from the second closure to the first closure; wherein two discharge pipes are a first discharge pipe and a second discharge pipe respectively; a microporous filtering medium at the first discharge pipe is a first microporous filtering medium, and a microporous filtering medium at the second discharge pipe is a second microporous filtering medium; and the three layers of stirring paddles are respectively located above the first microporous filtering medium, above the second microporous filtering medium and below the second microporous filtering medium; wherein a liquid outlet valve is arranged on a pipeline connected with the end portion of the discharge pipe; the liquid outlet valve is connected with a filtrate outlet pipe; and the filtrate outlet pipe is provided with a first regulating valve; wherein a remote turbidimeter is arranged on the position of the filtrate outlet pipe near the liquid outlet valve, and the filtrate outlet pipe between the remote turbidimeter and the first regulating valve is provided with a remote filtrate flowmeter; the filtrate outlet pipe between the remote turbidimeter and the remote filtrate flowmeter is provided with an initial filtrate return valve, and the initial filtrate return valve is connected with a reactor through a pipeline.