The invention relates to the technical field of relay calibration, especially to a checking system of a quick-acting oil-pressure relay. The checking system comprises an operating bench; universal wheels are fixedly installed at the bottom of the operating bench; and an operating mechanism and a mounting mechanism are installed on the top board of the operating bench. The operating mechanism includes a display panel and a controller. The mounting mechanism consists of compressing mechanisms and a transition plate; the compressing mechanisms are connected at the two sides of the transition plate and are connected to the top board of the operating bench; and a to-be-checked quick-acting relay is connected to the upper part of the transition plate, so that the to-be-checked quick-acting relay is arranged between the compressing mechanisms. The checking system has characteristics of simple structure, great convenience in operation, high automation degree, fast testing speed, high testing data accuracy, and high testing data repeatability and is suitable for checking of quick-acting oil-pressure relays with various calibers at home and abroad. With a data transmission module, remote signal transmission is realized, the transmission efficiency of checking data is improved, the time is saved, and the work effect is improved.