Breathing trainer

The utility model discloses a breathing trainer which comprises an air intake tube, an air outtake tube, a breathing tube and at least two air limit caps. The air intake tube, the air outtake tube and the breathing tube are intersected at one position to be communicated, an air intake check valve is arranged in the air intake tube, an air outtake check valve is arranged in the air outtake tube, a round hole is formed in the top of each air limit cap, hole diameters of the round holes in the different air limit caps are different, and each air limit cap can be inserted in the air outtake end of each air outtake tube. The breathing trainer is compact in structure and portable, and size of exhalation resistance can be adjusted according to self conditions of a user so as to train breathing capability.