The invention discloses an integral lock body behind a door. A ratchet shaft is arranged on a bottom plate, a ratchet sleeves the ratchet shaft, a ratchet torsion spring is arranged on the upper portion of the ratchet, the right side of the ratchet is provided with a ratchet limiting shaft, the left side of the ratchet is provided with a releasing arm, the releasing arm is provided with a releasing arm torsion, the bottom plate is further provided with a pawl shaft which is connected with a pawl linkage arm, the pawl shaft is arranged on the left side of the ratchet shaft, the pawl shaft is provided with a pawl and a pawl torsion spring, a pawl shock-absorbing block is arranged on the right side of the pawl shaft, the rear side of the ratchet is provided with a motor, the left end of the motor is connected with a worm rod, the worm rod meshes with the worm rod, and a worm wheel is fixed to the bottom plate through a worm shaft and arranged on the rear side of the worm rod; a socket secondary assembly is arranged on the upper portion of the lock body, and the left side of the socket secondary assembly is provided with an emergency unlocking rocker. The lock body has the advantages that the structure is compact, the stability is high, the lock body is safe and reliable, the dust proofing performance and the water proofing performance are excellent, the function is comprehensive,the assembling is rapid and convenient, the lock body is suitable for production line operation, and the production cost is reduced.