Plug pin convenient to plug and pull and firm in locking

A bolt convenient to insert and pull and firm in locking relates to the technical field of locking pieces and comprises a pin shaft seat, a pin shaft sleeve and a pin shaft, two supporting sleeves are arranged on the pin shaft seat in parallel at intervals, the pin shaft penetrates through the two supporting sleeves, a handle is fixedly connected to the pin shaft located between the two supporting sleeves, the handle is provided with a locking hole, and the locking hole is communicated with the pin shaft. A supporting lug capable of being inserted into the locking hole is arranged on the pin shaft seat, a through hole is formed in the supporting lug, the pin shaft sleeve is located on the left side of the pin shaft seat and provided with a kidney-shaped through hole, an end head used for being inserted into the kidney-shaped through hole is arranged at the left end of the pin shaft, and the cross section of the end head is in a drum shape. The pin shaft can move left and right and enable the end portion to be