The invention relates to a medicament for treating malignant tumors, which is characterized by being prepared from raw materials including avicennia pricklyash root, wild grape root, sapium sebiferum root, Chinese sweet gum root, figwort root, liquorice, oldenlandia diffusa, ophiopogon japonicus, lsodon amethystoides, cuckoo-bud, astragalus root, root of hairy asiabell, Paris polyphylla Smith, Chinese gooseberry root, thinleaf adina fruit, common dysosmatis rhizome and root, ladybell root, coastal glehnia root, rhizoma anemarrhenae, cochinchnese asparagus root, pangolin, oyster, ciliatenerve knotweed root, fructus forsythiae, root of common peony, lucid ganoderma, winged euonymus twig, rhamnus crena and sediment. The medicament has the effects of moisturing without grease, replenishing without dryness, attacking without damaging the healthy atmosphere and dispelling without hurting the yin. A preparation process of the medicament has the advantages of simple steps, short treatment period, no toxic and side effect, and is capable of enhancing the immunity, improving the body mass to remove the toxins and prolonging the life.