The invention relates to a ketoprofen transdermal patch and a preparation method thereof. The ketoprofen transdermal patch comprises a backing layer, a drug-containing colloid layer and an anti-sticking layer, wherein the drug-containing colloid layer comprises ketoprofen, a humectant, an absorption enhancer, a colloid matrix material and an additive. The ketoprofen transdermal patch can improve the local drug concentration of a pain part, can regulate an administration dosage through control of an administration area, can interrupt administration at any time, is convenient in use, and improves the compliance of medication. The ketoprofen transdermal patch has a high drug loading capacity and a good transdermal absorption effect, is small in skin irritation, is free from allergy-prone components, is free from pollution; is good in breathability, is good in skin fitting performance, can be easily peeled off, does not have peculiar smells, does not have skin irritation or anaphylactic reaction, is high in safety, has a simple preparation technology, is easy in implementation, is good in stability, is used for treating rheumatism / rheumatic arthritis and has a good clinical effect.