Non-slip type stepless speed change device

The invention discloses a non-slip type stepless speed change device and belongs to the technical field of transmission devices. A rolling friction variable transmission mechanism is arranged between a driving friction disc and a driven friction disc which are arranged in parallel in a way of deviating from the axis; the friction speed change mechanism is a ball-disc friction speed change mechanism or wheel-disc friction speed change mechanism; and the transmission ratio is changed by changing the ratio of the distances from the contact point between the friction speed change mechanism and the driving friction disc to a driving shaft and the distance from the contact point between the friction speed change mechanism and the driven friction disc to a driven shaft. By using the non-slip type stepless speed change device, the shortage that each traditional stepless speed change device cannot eliminate the relative sliding between friction surfaces is overcome, the sliding of the friction surfaces is changed into