Script doesn't work when i touch the button on touch?

It should work, it's probably because half of your code is green (meaning it is included in the "--", usually it is used to put notes in the script and will not be run by the script).

function touched(hit)
	task.wait(0.1)
	if hit.Parent ~= nil then
		local h = hit.Parent:FindFirstChildWhichIsA("Humanoid")
		if h ~= nil then
			if h.Health > 0 then
				local s = hit.Parent:FindFirstChild("Shirt")
				local p = hit.Parent:FindFirstChild("Pants")
				local t = hit.Parent.Torso:FindFirstChild("roblox") 
				if s ~= nil then
					s:remove()
				end
				if p ~= nil then
					p:remove()
				end
				h.MaxHealth = 200
				if t ~= nil then
					if t.Texture == "http://www.roblox.com/asset/?id=3555194" then
						h.MaxHealth=500 --i could cheat right here, but i like a fair game. :)
					else
						t:remove()
					end
				end
				h.Health = h.MaxHealth
				h.Health -= 1
				
				for _, limb in h.Parent:GetChildren() do
					if limb:IsA("BasePart") then
						if limb.Name == "Head" then
							limb.BrickColor = BrickColor.new("Black")
						else
							limb.BrickColor = BrickColor.new("Light stone grey")
						end
					end
				end
			end
		end
		task.wait(0.5)
	end
end

script.Parent.Touched:Connect(touched)