Tea leaf preparation method capable of removing harmful substances in tea leaves

The invention provides a tea leaf preparation method capable of removing harmful substances in tea leaves, relates to a processing method of tea leaves and in particular relates to a processing method of black tea. The preparation method comprises the following steps of: cleaning fresh leaves, killing out with steam, stacking a pile and fermenting, spreading, cooling, baking, stacking a big pile and fermenting, steaming, preparing and sizing, increasing fragrance, cooking at high temperature, cooling, baking and the like. By utilizing the method, the harmful substances such as heavy metal, pesticide residues and the like can be effectively removed, and active substances of the tea leaves can be guaranteed not to run off; meanwhile, the colour, flavour and taste of the tea leaves can be perfect, products have savoury and mellow taste, thick taste and good liquor colour and are durable and resistant to bubbles, and the technical indexes of the products are detected to be greatly higher than national standard by