The invention relates to a preparation method for a Sappan Wood extract, in particular to a preparation process for Sappan Wood extract perfusate and application thereof in treating 
bladder cancer, which solves the problem of the application of the Sappan Wood extract in treating 
bladder cancer tumors. The preparation process comprises the following steps: taking and smashing Sappan Wood, carrying out water extracting for three times, combining the extracting solutions obtained by three-time water extracting, and carrying out decompression concentrating; standing overnight, and removing sediments; adding 
petroleum ether, extracting, and retaining aqueous phase; adding 
ethyl acetate, extracting, and removing the aqueous phase; carrying out decompression volatilizing to remove all the 
ethyl acetate; weighing dry substances, adding 
purified water to enable the dry 
substance content to be 2%, heating for dissolving, standing overnight at 
room temperature, and filtering out sediments; and freeze-
drying, and carrying out split charging. The experiment 
research result shows that the extract has obvious killing effect on bladder 
neoplasm cells; and compared with mitomycin, 
epirubicin, 
Pirarubicin and other anticancer drugs, which are clinically and frequently used, the Sappan Wood extract perfusate has the advantages of high anticancer activity, less 
toxicity, safety, effectiveness and the like.