The invention provides a multifunctional diaper side leak detection device, comprising a detection box, a primary support leg, a secondary support leg, a support rod, a connecting seat, a U-shaped slide block, a linear slide rail, an amplifiable placement door structure, a suction pump, a waste liquid treatment and cleaning storage barrel structure, a diaper quick clamping plate structure, a pressing detection jet pipe structure, a colored liquid stirring mixing barrel structure, a metal flexible conduit and a telescopic metal hose. Through adoption of a press rod, a fixing sleeve pipe, a fixing clasp, a compression spring, a press handle, an annular liquid discharge pipe and a hollow fixing plate, a squeezing effect on diapers can be improved, the state of squeezing the diapers by a humanbody can be simulated, and multiple detection functions for the diapers are increased. Through adoption of fixing screws, a sliding pipe, clamp plates, fastening nuts, a telescopic screw, a connecting pipe and wing-shaped adjusting bolts, diapers of different sizes can be clamped and detection can be carried out smoothly.