The invention relates to a process of jacking utilizing a horizontal trolley of a jack for a caisson, comprising processes of: taking the horizontal trolley of the jack in position; primary pressurizing the jack; taking a transition carriage of the caisson in position; depressurizing the jack, and then pulling the horizontal trolley of the jack out of a jack pit. The invention adopts the horizontal trolley of the jack to jack, therefore complex process that needs a slide rail and a fixed steel plate and adjustment thereof in traditional technology is omitted, mechanical cooperation is not needed, and a large quantity of requirements of a lifting appliance because of line production and cross operation is reduced; the requirements of high strength construction are met flexibly and rapidly,and safety of appliances and personnel is ensure; difficulty that the caisson is jacked without the lifting appliance is effectively solved due to convenient movement.