Is it really difficult to find a job in Canada?

This can't be generalized, it depends on what major you study, what is your highest education, how long you have worked, and whether you have Canadian work experience. If your highest education and previous work experience were completed in China, it is difficult for you to find a job in Canada. If you have received higher education in Canada or worked in Canada for some time, it will be easier for you to find a job in Canada.