I am a contract worker. If I leave my job as an immigrant, will the company give me a month's compensation every year?

According to the contract law, this belongs to your voluntary resignation and you need to inform the unit one month in advance.

If you say that the unit compensates you for one year, that is, the compensation of January salary, it should be the compensation given to you when the unit dismisses you. Pay one month's salary to each length of service according to the number of years of work, and calculate it as one month for less than one month.