The invention discloses a flow value plate for a flow value instrument. Flow value scales are engraved in the flow value plate, and are annularly spread outwards from a cylinder outer circle. By engraving the flow value scales in the flow value plate for the flow value instrument, a flow value is determined, and then the quick reading can be performed, so that the determination accuracy is improved, and various errors caused by the reading through a vernier caliper are effectively avoided. Meanwhile, the flow value plate can be applied to a manual lifting cylinder type flow value instrument, and can be applied to an automatic lifting cylinder type flow value instrument. Particularly, when the flow value plate is applied to the automatic lifting cylinder type flow value instrument, the measurement stability of data can be greatly improved, and the flow value plate is high in accuracy and can be well applied to the determination of flow values of various materials in the civil work.