Unidirectional flow clamp head

The invention provides a unidirectional flow clamp head. The unidirectional flow clamp head comprises a clamp body, as well as a centralizing body, a sealing seat, a sealing body and an elastic devicewhich are coaxially arranged in an inner cavity of the clamp body, wherein an oil guide hole and a centralizing hole are formed in the centralizing body, the centralizing body divides an inner cavityof the clamp body into two cavities, the two cavities communicate with each other through the oil guide hole, the sealing seat is fixed in one of the cavities, a through hole is formed in the middleof the sealing seat, the sealing body comprises a sealing rod and a sealing head which are fixedly connected, wherein the end, away from the sealing head, of the sealing rod is inserted into the centralizing hole, the portion, between the centralizing hole and the sealing head, of the sealing rod is sleeved with the elastic device, an outer diameter of the elastic device is larger than a diameterof the centralizing hole, an