A pill crusher, comprising: a base; a stopper, arranged on said base, said stopper provided with a long axle hole; a U-shaped movable crushing member, sheathed outside said stopper, said U-shaped movable crushing member comprising a crushing plate located at a first side of said stopper and two side walls respectively connected with two sides of said crushing plate, said two side walls pivotally connected with the long axle hole of said stopper through a first rotating axle, said first rotating axle elastically supported on an upper end of said long axle hole, said U-shaped movable crushing member capable of pivoting with respect to said stopper to form a V-shaped crushing cavity capable of being closed by pressing or being opened between said crushing plate and said stopper, and, as said first rotating axle moving from the upper end to a lower end inside said long axle hole, said U-shaped movable crushing member capable of rubbing downward with respect to said stopper; a first connecting rod, located at a second side of said stopper, said first connecting rod having a first end pivotally connected with said stopper, and a second end; a handle, having a first end pivotally connected with the second end of said first connecting rod, and a pivoting portion pivotally connected with said two side walls of said U-shaped movable crushing member; said U-shaped movable crushing member, said first connecting rod, said handle, and said stopper collectively form a deformable four-connecting-rod structure having four rotating axles, as said handle is pressed downward, an angle between said first connecting rod and said handle is increased, and a space of said V-shaped crushing cavity is gradually closed; as said handle is lifted upward, the angle between said first connecting rod and said handle is decreased, and the space of said V-shaped crushing cavity is gradually opened. a base; a stopper, arranged on said base, said stopper provided with a long axle hole; a U-shaped movable crushing member, sheathed outside said stopper, said U-shaped movable crushing member comprising a crushing plate located at a first side of said stopper and two side walls respectively connected with two sides of said crushing plate, said two side walls pivotally connected with the long axle hole of said stopper through a first rotating axle, said first rotating axle elastically supported on an upper end of said long axle hole, said U-shaped movable crushing member capable of pivoting with respect to said stopper to form a V-shaped crushing cavity capable of being closed by pressing or being opened between said crushing plate and said stopper, and, as said first rotating axle moving from the upper end to a lower end inside said long axle hole, said U-shaped movable crushing member capable of rubbing downward with respect to said stopper; a first connecting rod, located at a second side of said stopper, said first connecting rod having a first end pivotally connected with said stopper, and a second end; a handle, having a first end pivotally connected with the second end of said first connecting rod, and a pivoting portion pivotally connected with said two side walls of said U-shaped movable crushing member; said U-shaped movable crushing member, said first connecting rod, said handle, and said stopper collectively form a deformable four-connecting-rod structure having four rotating axles, as said handle is pressed downward, an angle between said first connecting rod and said handle is increased, and a space of said V-shaped crushing cavity is gradually closed; as said handle is lifted upward, the angle between said first connecting rod and said handle is decreased, and the space of said V-shaped crushing cavity is gradually opened.