its a resolution. they can’t end a presidential national emergency declaration.
The Act empowers the President to activate special powers during a crisis but imposes certain procedural formalities when invoking such powers. The perceived need for the law arose from the scope and number of laws granting special powers to the executive in times of national emergency. Congress can terminate an emergency declaration with a joint resolution signed into law. Powers available under this Act are limited to the 136 emergency powers Congress has defined by law.
The legislation was signed by President Gerald Ford on September 14, 1976. As of February 2019, 59 national emergencies have been declared, more than 30 of which remain in effect.
So I assume that the President could veto the resolution, but then it goes back to both Houses of Congress to override, which requires a two-thirds vote in each Chamber.