Proportional dynamic pre-filling valve

The invention discloses a proportional dynamic pre-filling valve, and relates to the technical field of hydraulic systems. The proportional dynamic pre-filling valve comprises an upper valve body, a lower valve body, a pre-filling main valve element, a guide oil passing body, a proportional element, a connecting assembly and a fixing assembly; a load oil port is formed in the bottom of the lower valve body; a pre-filling oil port is formed in the side surface of the lower part of the upper valve body; a valve element opening oil port is formed in the top end of the guide oil passing body; a first control cavity is formed between the guide oil passing body and the pre-filling main valve element; a communicating hole is formed in the guide oil passing body; the lower end of the communicating hole passes through the bottom face of the guide oil passing body; the upper end of the communicating hole passes through the side face of the upper portion of the guide oil passing body. a valve element closing oil port is