The invention relates to a continuous waste rubber cracking reactor which comprises a driving device, a propelling device, a left sealing structure, a crushing device, a cutting mechanism, a cracking device and a right sealing structure which are sequentially connected. The propelling device comprises a first propelling shaft component and a second propelling shaft component, the first propelling shaft component comprises a rotating shaft and a first spiral band, one end of the rotating shaft is fixedly connected with a speed reducer of the driving device, the first spiral band is arranged on the periphery of the middle of the rotating shaft, the second propelling shaft component comprises a hollow sleeve type shaft body and a second spiral band, the second spiral band is arranged on the periphery of the shaft body, the shaft body sleeves the rotating shaft and is fixedly connected with the rotating shaft, the cutting mechanism comprises a cross cutter and a pore plate, the cross cutter is provided with a plurality of cutting blades, the pore plate sleeves the shaft body through bearings, and a plurality of small holes are formed in the pore plate. According to the continuous waste rubber cracking reactor, contact surfaces among catalysts and waste rubber particles are increased, the catalysts can be circularly used, cracking efficiency and oil yield are remarkably improved, and the service life of a motor is prolonged.