BEIJING — Americans view China in a markedly less favorable light than two years ago, and Chinese attitudes toward the United States have also soured, a sign that the two countries are drifting apart at the level of public opinion, according to a Pew Global Survey to be released on Thursday.

The survey showed that since 2011, China’s approval rating in the United States has dropped 14 percentage points to 37 percent, the lowest rating for China in any region in the world. Negative attitudes toward the United States among the Chinese rose to 53 percent, a nine-point increase.

The deep skepticism toward China in the United States reflected the persistent worry that China’s fast-growing economy, even though it is slowing, threatens jobs in a weak American economy, said Bruce Stokes, the director of Pew Global Economic Attitudes, in Washington.

But opinion makers in China, and Chinese people familiar with the United States, gave far broader reasons than pure economics for China’s sinking image.