The invention discloses equipment and method for measuring the coefficient of collapsibility of loess, and relates to the field of civil engineering measurement equipment. The equipment comprises a reaction frame, a vertical oil jack, a centering bearing plate, a dowel steel, a bottom bearing plate and observation equipment, wherein the reaction frame comprises a reaction cross beam, a stand column and a spiral steel column; the vertical oil jack is provided with a hydraulic pressure indicator, bubble levels are arranged at four corners of the centering bearing plate; the observation equipmentcomprises a digital level and an indium steel ruler matched with the digital level; and the indium steel ruler is fixed on the dowel steel through a ruler hoop. According to the equipment, the problem that loading is easily eccentric due to existence of a force-measuring loop in the prior art can be effectively controlled by using the hydraulic gauge, and the dowel steel is directly used as waterdelivery pipe for delivering water to an exploratory well, each part of the reaction frame is connected by adopting screws with simple assembly and disassembly, and the counter force provided by utilizing the spiral steel column and the pulling resistance of a soil mass is better than that provided by utilizing dead weight of overloading.