Is one Bitcoin node has One wallet only? I have configured Bitcoin core testnet on my VPS and by running bitcoin-cli command "bitcoin-cli -testnet getwalletinfo" its show wallet info and it create all new bitcoin testnet address under this.

Is there any bitcoin-cli command to create new wallet on same node ?
As of v 0.14.x, Bitcoin Core supports only one wallet.  You can't create more than one.

You can sort of achieve this by having multiple wallet files and choosing which one you rename to wallet.dat.  You have to restart Bitcoin Core to change between them.  It's error-prone and not an officially supported feature.  You can read more about it at Bitcoin-qt multiple wallets and transferring between?