However, experts doubt the capability of the missiles to hit their targets.
The tests were condemned by South Korea, Japan and the US, and prompted the drafting of the new UN sanctions.
The export of coal, ore and other raw materials to China is one of North Korea’s few sources of cash.
Earlier this year, China suspended imports of coal to increase pressure on Pyongyang.
However, repeated sanctions have so far failed to deter North Korea from continuing with its missile development.
The US ambassador said the Security Council had increased the penalty for North Korea’s ballistic missile activity "to a whole new level".
’Sanctions are not the goal’
China, North Korea’s only international ally and a veto-wielding member of the UN Security Council, voted in favour of the resolution this time.
In Manila, Foreign Minister Wang Si said the sanctions were "necessary" but were "not the ultimate purpose".
"Our purpose is to bring all parties involved in the nuclear issues back to negotiation table, finding the resolutions through talks to realise the denuclearization of Korean peninsula," he told journalists.