The invention relates to a crusher, in particular to a fruit crusher with a protection function. The fruit crusher comprises a shell and a sieve installed in the shell. The sieve divides the shell into a crushing chamber and a storage chamber; the crushing chamber is located on the storage chamber and internally provided with a first rotary shaft which is provided with a crushing device; the crushing device comprises clamping bases and crushing tools which are connected with the clamping seats through screws correspondingly; the crushing chamber is further internally provided with an inner sleeve which is composed of a plurality of valves; a compression spring is connected between the inner wall of each valve and the inner wall of the crushing chamber; the inner wall of each valve is further uniformly provided with crushing teeth; the storage chamber is in an inverted conical shape; and the lower end of the storage chamber is provided with a discharging outlet which is provided with a switch. According to the fruit crusher, crushed particles are more uniform, the structure is simple, the crushing efficiency is high, the crushing effect is good, and the shell is effectively protected.