Cover	Apr. 12, 2024
Cover [Abstract]
Entity Registrant Name	HORIZON SPACE ACQUISITION I CORP.
Entity Central Index Key	0001946021
Document Type	8-K
Amendment Flag	false
Entity Emerging Growth Company	true
Document Period End Date	Apr. 12, 2024
Entity Ex Transition Period	false
Entity File Number	001-41578
Entity Incorporation State Country Code	E9
Entity Address Address Line 1	1412 Broadway
Entity Address Address Line 2	21st Floor
Entity Address Address Line 3	Suite 21V
Entity Address City Or Town	New York
Entity Address State Or Province	NY
Entity Address Postal Zip Code	10018
City Area Code	646
Written Communications	false
Soliciting Material	false
Pre Commencement Tender Offer	false
Pre Commencement Issuer Tender Offer	false
Local Phone Number	257-5537
Security 12b Title	Ordinary Share, $0.0001 par value
Trading Symbol	HSPOU
Security Exchange Name	NASDAQ