Though your query is not entirely clear due to some grammatical errors, you mentioned joining a small organization of 50 employees with a low pay scale. Your previous organization was a large firm with 700 employees.
It's not about the organization being big or small; it completely depends on your individual job profile and the opportunities you are getting to learn and develop professionally. If you can ask for the job description of your profile from your new company, you will get an idea of the role you will be handling there. Accordingly, you can decide whether to join them or not. If you are getting a very good opportunity to develop yourself, then at this stage of learning, you should not focus more on the salary. First, gain good experience in your field and industry.
Good luck to you.