A scheduling timing determination method, a terminal and a network side device are provided. The method includes: receiving scheduling information of a network side device carried by a control channel on a scheduling carrier, obtaining a slot offset between the control channel and a data channel according to the scheduling information; determining a relative slot where the data channel is transmitted on the scheduled carrier according to a subcarrier spacing of the scheduling carrier, a subcarrier spacing of the scheduled carrier, the slot offset between the control channel and the data channel, and a starting symbol of the control channel transmitted in a slot on the scheduling carrier, where the relative slot uses a starting time of the slot where the control channel is transmitted on the scheduling carrier as a reference point; determining a transmission slot of the data channel on the scheduled carrier according to the relative slot.