112 new blocks and items were added to Minecraft 1.13 java edition.
Update Aquatic
The Update Aquatic is a major update to oceans, an overhaul of block ids, as well as a number of new blocks and items. Ocean biomes saw the addition of coral, new mobs (turtles, dolphins), some new structures (shipwrecks) and the new tropical fish (you can try the tropical fish generator here)
Acacia Pressure Plate
Acacia Trapdoor
Acacia Wood
Birch Pressure Plate
Birch Trapdoor
Black Bed
Blue Bed
Blue Ice
Brain Coral
Brain Coral Block
Brain Coral Fan
Brown Bed
Bubble Coral
Bubble Coral Block
Bubble Coral Fan
Bucket of Cod
Bucket of Pufferfish
Bucket of Salmon
Carved Pumpkin
Chipped Anvil
Conduit
Cyan Bed
Damaged Anvil
Dark Oak Pressure Plate
Dark Oak Trapdoor
Dark Oak Wood
Dark Prismarine Slab
Dark Prismarine Stairs
Dead Brain Coral
Dead Brain Coral Block
Dead Brain Coral Fan
Dead Bubble Coral
Dead Bubble Coral Block
Dead Bubble Coral Fan
Dead Fire Coral
Dead Fire Coral Block
Dead Fire Coral Fan
Dead Horn Coral
Dead Horn Coral Block
Dead Horn Coral Fan
Dead Tube Coral
Dead Tube Coral Block
Dead Tube Coral Fan
Debug Stick
Dried Kelp
Dried Kelp Block
Fire Coral
Fire Coral Block
Fire Coral Fan
Gray Bed
Green Bed
Heart of the Sea
Horn Coral
Horn Coral Block
Horn Coral Fan
Jungle Pressure Plate
Jungle Trapdoor
Kelp
Light Blue Bed
Light Gray Bed
Lime Bed
Magenta Bed
Mushroom Stem
Nautilus Shell
Orange Bed
Petrified Oak Slab
Phantom Membrane
Pink Bed
Prismarine Brick Slab
Prismarine Brick Stairs
Prismarine Slab
Prismarine Stairs
Purple Bed
Scute
Sea Pickle
Seagrass
Shulker Box
Smooth Quartz Block
Smooth Red Sandstone
Smooth Sandstone
Smooth Stone
Spruce Pressure Plate
Spruce Trapdoor
Stripped Acacia Log
Stripped Acacia Wood
Stripped Birch Log
Stripped Birch Wood
Stripped Dark Oak Log
Stripped Dark Oak Wood
Stripped Jungle Log
Stripped Jungle Wood
Stripped Oak Log
Stripped Oak Wood
Stripped Spruce Log
Stripped Spruce Wood
Trident
Tube Coral
Tube Coral Block
Tube Coral Fan
Turtle Egg
Turtle Shell
White Bed
Yellow Bed
Technical blocks that can't be placed in inventory, can be placed in world by /setblock. Not included in our new block count, as usually they are attached to an item version.
1.13
Brain Coral Wall Fan
Bubble Column
Bubble Coral Wall Fan
Cave Air
Dead Brain Coral Wall Fan
Dead Bubble Coral Wall Fan
Dead Fire Coral Wall Fan
Dead Horn Coral Wall Fan
Dead Tube Coral Wall Fan
Fire Coral Wall Fan
Horn Coral Wall Fan
Kelp Plant
Tall Seagrass
Tube Coral Wall Fan
Void Air
Wall Torch