Cover - shares	3 Months Ended
	Mar. 31, 2026	May 13, 2026
Document Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Transition Report	false
Amendment Flag	false
Entity Registrant Name	RISING DRAGON ACQUISITION CORP.
Entity Central Index Key	0002018145
Entity File Number	001-42368
Entity Tax Identification Number	00-0000000
Document Period End Date	Mar. 31, 2026
Document Fiscal Year Focus	2026
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Address, Address Line One	No. 604, Yixing Road
Entity Address, Address Line Two	Wanbolin District
Entity Address, Address Line Three	Taiyuan City
Entity Address, City or Town	Shanxi Province
Entity Address, Country	CN
Entity Address, Postal Zip Code	030024
Entity Incorporation, State or Country Code	E9
City Area Code	+86
Local Phone Number	18817777987
Entity Interactive Data Current	Yes
Entity Current Reporting Status	Yes
Entity Shell Company	true
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Common Stock, Shares Outstanding		5,951,030
Units, each consisting of one Ordinary Share, par value $0.0001 per share, and one Right entitling the holder to receive one-tenth of an Ordinary Share
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Ordinary Share, par value $0.0001 per share
Trading Symbol	RDACU
Security Exchange Name	NASDAQ
Ordinary Shares
Document Information [Line Items]
Title of 12(b) Security	Ordinary Shares
Trading Symbol	RDAC
Security Exchange Name	NASDAQ
Rights
Document Information [Line Items]
Title of 12(b) Security	Rights
Trading Symbol	RDACR
Security Exchange Name	NASDAQ