i want to build a wood buring boiler,any body has got an idea what materials i need to buy and how can i set it?

What are you going to use this for? There are wood burning boilers available commercially that are used for heating homes. I don't know where to get them at, but I do know two people that have them. I guess you would have to do a Google search to find them.

You may also be able to do a search for do it yourself projects to build a boiler, but I have never heard of anyone doing this. I f you do build your own, just make sure you take every safety precaution available. Boilers can be dangerous.

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i was interested in your idea ,so i surfed the internet and found some answer to your request,maybe it helps
"I simply bought some thin walled oval top loading wood stoves, took some 1/4" copper tubing and

tightly wrapped the entire stove with the tubing. As the water in the coils heats it rises, pulling

in more cold water from the tub, creating a natural thermal syphon. I dont know what your application

is, but that general design worked very well for heating my mobile hot tubs.
I also incorperated a 12V pump, batteries and solar panels. Point of use propane water heater, a

secondary boiler pulling heat from the cast iron woodstove inside the built in sauna. and of course

the traditional 110/220V hot tub equipment. any or all of the systems could work independantly or

together." this is the exact quote i found