bip148 is hard or soft fork will the bitcoin going to splitted ?

No,btc BIP148 isnot a hard fork it is a soft fork. most time a hard fork is often confused with a blockchain split. A hard fork is the type of chain split where the rule changes are loosened to allow previously disallowed block or transaction. A soft fork is the tightening of the new rules. A soft fork will be result in a converged chain but if the majority of hashpower enforces its rules.
Delicate forks depend on the financial motivating forces of the dominant part of mineworkers and monetary on-screen characters to dismiss invalid pieces in view of the new ruleset. Since the new BIP148 rules are a stricter set than the old standards, any chain split means the chain with the old guidelines would be in risk of being wiped out. In the event that the lion's share of mineworkers authorize the new ruleset, all pieces created that are invalid in the new ruleset will end up plainly stranded. This monetary motivating force pushes mineworkers to uphold the new principles. A UASF utilizes comparative monetary motivations. On the off chance that the greater part of hashing power authorizes the new guidelines, chain parts stay transitory as with an exclusively excavator upheld delicate fork.

and the event that the dominant part of hashpower does not implement the standards, a chain split would happen. In the event that there is a more prominent interest for the pieces delivered by the BIP148 diggers, at that point benefit driven mineworkers would in the long run rush to this chain, prompting the stranding of the pre-delicate fork chain. In the event that the request is less for the delicate fork chain, at that point the two chains may exist together inconclusively.