a portable pneumatic tool includes a housing composed of two symmetric half shells or several partially cut - away shells ; an air inlet module unit , a valve actuating module unit and an operating module unit fluidically communicated with one another and connected with flexible hoses among the module units ; and a shock - absorbing unit retained between the operating module unit and the housing ; whereby upon embedding or fixation of all the module units into the corresponding cavities in the shells and upon combination of the shells , a portable pneumatic tool will be instantly obtained having advantages of light weight , shock - absorbable property , easy assembly , lower production cost and convenient maintenance .