The invention relates to the technical field of medical crutches, and discloses a multi-functional medical crutch. The multi-functional medical crutch comprises a medical crutch body. The top of the medical crutch body is fixedly connected with an axilla supporting block. The multi-functional medical crutch is capable of solving problems that the medical crutch is single in function, situations, such as falling down, easily happen while the medical crutch is used in winter, or a user feels uncomfortable in a using process, and a sense of safety cannot be given to the user. A height adjusting rod installed on the right wall of a second cylinder passes through the second cylinder and a first cylinder, so a second circular column and a first circular column in the second cylinder and the first cylinder can be fixed, and the two circular columns have three gear-shifting positions correspondingly. Through the adjustment of an inserting position of a height adjusting rod to a height, a handle connected and positioned on the right wall of a welding block can realize the effect of illuminating secondly, and a groove-shaped support column fixedly connected and positioned on the front face of the welding block is cooperated with a long groove block so as to support an arm.