The invention provides a method for measuring the corrosion rate of sacrificial concrete, which comprises the following steps: manufacturing a sacrificial concrete specimen; connecting each thermocouple with a multi-channel temperature measuring instrument; injecting molten stainless steel into the sacrificial concrete specimen, and switching on the multi-channel temperature measuring instrument; recording the non-reading-displayed moment of the multi-channel temperature measuring instrument on which each thermocouple with a serial number is located, wherein no reading is displayed on the multi-channel temperature measuring instrument on which each thermocouple with a serial number is located refers to that sacrificial concrete is molten to the position of the thermocouple; recording the non-reading-displayed moment of the multi-channel temperature measuring instrument on which each thermocouple with a serial number is located; and according to the position of each thermocouple in the sacrificial concrete and the non-reading-displayed moment of the multi-channel temperature measuring instrument on which each thermocouple with a serial number is located, calculating the corrosion rate of the obtained sacrificial concrete. The method is implemented by using conventional measuring instruments, simple and convenient to operate, and low in cost; and the method can simultaneously measure the axial and radial corrosion rates of sacrificial concrete, more measuring data is obtained, and the measuring precision is high.