The utility model relates to the technical field of in-situ leaching mine production, in particular to a well site liquid-injection alarming system for an in-situ leaching mine, and aims to solve the problem that in the in-situ leaching production process of the mine, a liquid injection hole cannot be immediately detected after a connecting pipe of the liquid injection hole is broken or the liquid injection hole is blocked. The well site liquid-injection alarming system is characterized by comprising a flowmeter, a signal isolator, a PLC and an upper computer, wherein the flowmeter is connected with one end of the signal isolator; the other end of the signal isolator is connected with one end of the PLC; the other end of the PLC is connected with the upper computer; the upper computer is further connected with an alarm apparatus. According to the well site liquid-injection alarming system disclosed by the utility model, in the actual using process, the abnormal situation of the liquid injection hole can be monitored by operators on duty in a control machine room through the existing equipment and can be dealt with immediately; the well site liquid-injection alarming system brings convenience for technicians to detect and analyze the operating data of the liquid injection hole of each mining area, and avoids the pumping-injection unbalance phenomenon of each mining area; the system has the characteristics of being quick in fault finding, direct in alarming, direct in detection, convenient to monitor, capable of reducing working strength of personnel, high in practicability and low in cost.