The invention relates to an easily overhauled micro full mixed flow horizontal water-turbine generator set which solves the problem of overhauling and replacing a damaged pushing-guiding bearing of the set effectively without detaching any large parts of the water-turbine generator set. A generator and a water turbine are mounted on a base; a rotor shaft of the generator is transversely and concentrically connected to a rotary shaft of the water turbine through a middle connecting structure; a generator side shaft coupling device and a water turbine side shaft coupling device are mounted at two ends of the middle shaft; the generator side shaft coupling device connects the middle shaft to the rotary shaft of the generator concentrically; the water turbine side shaft coupling device connects the middle shaft to the rotary shaft of the water turbine concentrically; a main shaft seal is mounted at the connection part of the rotary shaft and the shell of the water turbine; one end, close to the middle shaft, of the generator shaft is mounted on a pushing-guiding bearing on the shell and is connected to the middle shaft through the generator side shaft coupling device; the rotary shaftextending out the other side of the shell of the generator is mounted in a guiding bearing on the shell of the generator; and a water turbine guiding bearing is mounted on the rotary shaft between thewater turbine side shaft coupling device and the water turbine.