The invention relates to a clutch and a vehicle variable speed assembly of a hybrid vehicle. The clutch is used as an independent component to be connected among a first power source output shaft, a second power source output shaft and a fixed shaft type variable speed gear set input shaft of the vehicle. The clutch comprises a composite type planetary mechanism and a control mechanism. The composite type planetary mechanism is connected among the first power source output shaft, the second power source output shaft and the fixed shaft type variable speed gear set input shaft, and is formed by compositing a single-planet row and a double-planet row in a component sharing mode; the control mechanism is used for controlling components in the composite type planetary mechanism so as to enable power transmitted by the first power source output shaft and/or the second power source output shaft to be transmitted to the fixed shaft type variable speed gear set input shaft through the composite type planetary mechanism. Through the composite type planetary mechanism, the clutch and the vehicle variable speed assembly have the advantages of being simple in structure, low in cost and strong in function, easily achieving the multi-gear aim, conveniently achieving automation and the like.