A button water-saving shower including a shower body and a water-saving mechanism, an inlet passage communicating with a water source and an outlet cavity arranged in the body; the water-saving mechanism is arranged in the body in a vertically sliding manner, and includes a pressing mechanism similar to an automatic ball pen and a floating cover connected to the pressing mechanism; the outlet cavity communicates with the inlet passage and includes at least one inlet hole of which the outlet sectional area is changed along with the vertical movement of the floating cover. The shower can achieve water-saving through a button and achieve switching of outlet functions through a water division unit with ease of use and practicality.