The invention discloses a rapid manufacturing device for an annular washer. The rapid manufacturing device for the annular washer comprises a vertically-arranged vertical board; a washer mold is arranged at the end portion of the bottom of the vertical board; the edge of the washer mold is hinged to the bottom of the vertical board; a plastic nozzle is arranged on one side of the vertical board; an ejecting-out mechanism is arranged on the other side of the vertical board and comprises a fixing ring; protrusions are arranged on the fixing ring; a pulley is arranged on the fixing ring; a pull rope is arranged on the washer mold; a torsional spring is arranged at the hinged position of the washer mold and the vertical board; and the washer mold swings and moves in a reciprocating mode under the action of the tensile force of the pull rope and elasticity of the torsional spring. Compared with the prior art, the washer mold is in a to-be-injected plastic state under the action of elasticity of the torsional spring, the washer mold moves towards the protrusions on the fixing ring after plastic is injected under traction of the pull rope until the protrusions eject a plastic washer not molded completely to be out of the washer mold, the plasticity of the plastic washer is high at the moment, and subsequent machining is convenient.