The invention discloses an ambroxol hydrochloride sustained release capsule and a production process thereof.The ambroxol hydrochloride sustained release capsule is composed of a plain pill and a sustained release coating according to the mass ratio of 100: (6.0-7.5); the plain pill is prepared from, by weight, 55 parts of 30-40-mesh saccharose pill cores, 75 parts of ambroxol hydrochloride, 70-75 parts of saccharose, 15-20 parts of starch, 0-3 parts of silicon dioxide, 0-1 part of magnesium stearate and 55-75 parts of adhesive solution; the sustained release coating is prepared from, by weight, 6 parts of Eudragit L100, 3 parts of saccharose, 1.0-1.5 parts of talcum powder, 100-270 parts of ethyl alcohol and 15-35 parts of pure water.On the premise of ensuring good quality, a simple matching and preparation method is adopted.