The invention relates to the field of carpet cleaning supplies, in particular to a handheld carpet stain remover. The carpet stain remover comprises a shell and a handle, wherein a motor, a fan, a shift fork, a shift rod, a plunger, a liquid injection barrel, a ventilation channel and limit blocks are arranged in the shell, a first gear, an incomplete gear and a rotating disc are coaxially arranged on an output shaft of the motor, and an annular groove, a brush and water outlet holes are arranged on the rotating disc; a ring and a tooth part are arranged on a fan; support blocks, through holes, electric heating wires and first springs are arranged on the liquid injection barrel; an air cylinder air hole, a piston rod, a second spring, a rack, a cover plate, a third spring and a hose are arranged in a handle, a water storage tank is connected onto the handle and connected with an air cylinder, and a one-way valve is mounted in a water supply pipe. The handheld carpet stain remover solves the problems that carpets with down are not thoroughly cleaned and down is mixed and intertwined in the prior art and has the advantages of being portable and light.