Opening retaining device of fusible safety valve driver

The invention discloses a fusible safety valve driver opening retaining device which comprises a retainer body, a mounting cavity is formed in the bottom of the retainer body, a hot melting element is arranged in the mounting cavity, and the retainer body is fixed to a shell of a safety valve driver assembly through a positioning mechanism. The hot melting element abuts against a driver indicating rod in the safety valve driver assembly, and the driver indicating rod is pressed downwards. An adjusting mechanism for pressing down and adjusting the hot melting element is arranged on the retainer body; during normal use, the safety valve driver assembly is always kept in a completely-opened state; when the temperature of the safety valve driver assembly rises to a set value due to a fire accident in a well site, automatic closing of the safety valve and the driver can be achieved, and automatic well closing is achieved. No control medium exists, so that the medium cannot be discharged under the fire hazard condi