The invention discloses medicine for treating the spleen-deficiency qi sinking type puerperal constipation and a preparing method thereof. The medicine comprises fructus cannabis, herba portulacae, badger fat, polygonum multiflorum, semen boitae, orobanche coerulescens, angelica sinensis, semen sesami nigrum, semen armeniacae amarae, wild walnut meat, odontoglossum crispum, cynanchum mooreanum, radix polygonati officinalis, calystegia hederacea, dracontomelon duperreanum, pericarpium citri reticulatae, mountain ash, abutilon indicum, fructus polygoni orientalis, folium sennae, rungia pectinata, rungia chinensis, fleshy spurge leaves, iris tectorum, dung beetles, pinecones, begonia wilsonii, roots or bark of seguin argyreia, gnaphalium tranzschelii, fruits of keiske wormwood, cowhells and copperas. The medicine has the advantages that the medicine is used for treating the spleen-deficiency qi sinking type puerperal constipation and has the effects of tonifying qi, moistening the intestines, strengthening the heart, tonifying the spleen, removing stagnancy, relaxing the bowels, nourishing qi, clearing damp, strengthening tendons and enriching the blood; syndrome differentiation is carried out through traditional Chinese medicine theories with the holism concept as the basis, the curative effect is good, effect taking is rapid, toxic and side effects are avoided, pertinence is high, the curative effect is remarkable, symptoms can be effectively treated, and the overall immunity of a puerpera can be further improved.