All 30 band members are committed to going on the trip and Greenwell said they will need to raise around $90,000.
A dedicated group of volunteers have so far managed to raise around 15 per cent of the cost and have set up a Boosted page where supporters can make donations.
The band will also travel within China and will visit Xi'an, home of the famous terracotta warriors.
"We will be part of a group of around 1000 Kiwis invited to the special ceremony as part of the Year of China New Zealand Tourism celebrations.
"It's a once-in-a-lifetime opportunity as we will be the first public group to view some newly discovered warriors."
Brass Whanganui was founded in 2001 with the amalgamation of two of New Zealand's most prestigious brass bands, the Wanganui Garrison Band and Wanganui City Brass.
Several generations of Whanganui families have been part of the band and many players go on to join other brass bands around New Zealand.
To find out more about Brass Whanganui's China trip visit the Facebook page and to help support their sojourn go to the Boosted page Getting Brass Whanganui to China.