The invention relates to a temperature/pressure release valve for a long tube trailer. The temperature/pressure release valve comprises a valve base, a valve base, a valve body, a valve element, a fusible plug and a blasting needle; a fluid channel is formed inside a base body of the valve base, the exterior of one port of the fluid channel is fixedly connected to the valve body, and the other port of the fluid channel is a fluid inlet; the interior of the valve body is provided with a first cavity and a second cavity, a connecting channel is arranged in the center of the position between the two cavities, the fusible plug is fixedly connected to an upper port of the second cavity, the valve base is installed on a lower port of the first cavity, and a fluid outlet is formed on the second cavity; the valve element comprises a valve rod and a valve disc, the valve rod is installed in the connecting channel inside the valve body in a sealed manner, and the valve disc is connected to the valve rod through threads and is connected to the valve base in a sealed manner; and the blasting needle is further fixedly connected between the valve rod and the fusible plug and is located in the center of the second cavity. By means of the temperature/pressure release valve, the problem that the blasting pressure of a blasting sheet is unstable is solved, and the working condition that single temperature/pressure condition release cannot be achieved when the blasting sheet and the fusible plug are combined.