Is it illegal to be a hotel decoration project manager without a qualification certificate?

Illegal. It is a prerequisite to have a first-class constructor certificate to be qualified as a large-scale project manager. Construction engineer refers to the registered personnel engaged in key positions of general contracting and construction management of construction projects. Construction engineer refers to the registered personnel engaged in key positions of general contracting and construction management of construction projects. The qualification system of builders originated from the western capitalist country Britain 1834. The meaning of construction engineer refers to a comprehensive talent who knows management, technology, economy, laws and regulations and has high comprehensive quality. He should not only have theoretical level, but also have rich practical experience and strong organizational ability.