Cover Page - shares	9 Months Ended
	Sep. 30, 2024	Nov. 11, 2024
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Quarterly Report	true
Document Transition Report	false
Document Period End Date	Sep. 30, 2024
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	Q3
Entity Registrant Name	HCW Biologics Inc.
Entity Central Index Key	0001828673
Current Fiscal Year End Date	--12-31
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	82-5024477
Entity Address, Address Line One	2929 N
Entity Address, Address Line Two	Commerce Parkway
Entity Address, City or Town	Miramar
Entity Address, State or Province	FL
Entity Address, Postal Zip Code	33025
City Area Code	954
Local Phone Number	842–2024
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Title of 12(b) Security	Common Stock
Trading Symbol	HCWB
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		37,823,394
Entity File Number	001-40591