Steven Spielberg -- Welcome ... to JURASSIC YACHT

Steven Spielberg doesn't do anything low budget ... especially when it comes to boating ... 'cause his private yacht is FRICKIN' ENORMOUS!!!

The Oscar winning director's $200 MILLION ocean vessel was spotted in Fort Lauderdale this week ... dwarfing everything else in the water.

The ridiculous craft -- named the Seven Seas -- comes loaded with amazing features like an infinity pool, 15-foot movie screen, gym, spa and even a helipad.

Plus, it sleeps 12 guests and 26 crew members and can reportedly be rented out for $1.3 million per week.