The invention discloses a production method of paper mill sludge landscape ornamental material, which is characterized by comprising the following raw materials according to parts by weight: 30 to 40 parts of paper mill sludge, 30 to 40 parts of epoxy resin leftover, 10 to 20 parts of reinforcing material, 5 to 7 of plant foaming granules, 3 to 5 of triethylenediamine and 3 to 5 parts of calcium peroxide. The production method comprises the following five steps of: first, preparing material; second, mixing; third, moulding and heat pressing; fourth, stacking and curing; and fifth, surface treatment. The prepared plank material is particularly applicable to be used as a flower bed boarding of the landscape area, is beautiful and elegant, and has low cost and water resistance and appropriate strength. The landscape ornamental plate is produced by the method, thus making waste profitable, not only solving the environmental problem, but also solving the problem of material for producing the artificial board; and the plank material has lighter weight and low energy dissipation in production.