The invention discloses a multifunctional lower limb strength training device.The multifunctional lower limb strength training device comprises a support, a body, a seat plate, a sliding groove, springs, bearings, a first connecting rod, sliding blocks, a second connecting rod and a pedal.According to the multifunctional lower limb strength training device, in circular training, a person only needs to lie on the seat plate with the feet stepping on the pedal, the person can exert strength with the lower limbs to overcome the elastic force of the springs and push the first connecting rod and the second connecting rod to move left and right together, and thus the lower limbs are trained in a targeted mode; besides, the person can sit on the seat plate with the feet stepping on foot plates at the front and rear ends of a rotating shaft respectively, the rotating shaft can be treaded by the feet to rotate, a friction block rubs against installation plates when the rotating shaft rotates, leg pushing resistance is formed, and thus the effect of training the lower limbs is achieved.The training device is simple in structure, powerful in function and capable of training the lower limbs in a targeted mode in many ways; besides, the person can conduct training indoors, so that time is saved, and a physical overdraft of the human body is not likely to happen.