I am Turkish and have indefinite to remain in UK. Can i go to Belgium without a visa?

No you still need a visa to travel to Belgium. Remember an indefinite to remain the the UK isn't the same as getting UK citizenship. Your still a Turkish citizen. Plus Turkey isn't in the EU. Indefinite Leave to Remain in Britain, commonly known as permanent UK residency. So that permit is just for the UK. It doesn't mean you are a British citizen. For example if someone from outside the EU get a residency permit in one of the EU countries, that residence permit is just for that country alone. They cannot travel freely as if they were an EU citizen. So visa rules apply to you.