The invention discloses a raw material composition and a production method for a plate type precision valve cast. The raw material composition comprises the following components by weight: 50 parts of Q10 pig iron, 40 parts of scrap parts, 10 parts of scrap steel, 0.5-1 part of ferrous silicon, 3-4 parts of scrap copper, 1.3-1.6 parts of a nodulizer and 1-1.2 parts of an inoculant. The formula and process of producing the plate type precision valve cast by using the composition are simple, and industrialization is easily achieved; the performance of the cast directly obtained from the casting state is greatly improved; the cost of the raw materials is lowered by one time as the raw materials producing the precision cast adopt common scrap steel, scrap parts and scrap copper; and the addition of an appropriate amount of scrap copper into the cast promotes the generation of pearlites, refines the grain sizes of the cast and improves the precision of the cast, and the cast has homogeneous surface microstructure and good airtightness.