The invention relates to a module locking and unloading device, belongs to the field of communication equipment, and particularly relates to a straight-pulling and self-sinking type module locking andunloading device. The straight-pulling and self-sinking type module locking and unloading device comprises a pull rod, a base and a lug, wherein at least two straight arms are symmetrically distributed on the pull rod; square holes are formed in the straight arms; two ends of each straight arm are separately provided with a stopping arm and a straight arm groove; a supporting arm with a round hole is arranged between the two straight arms; planes are oppositely arranged on the outer sides of the two straight arms; the planes are clamped by the two sides of the base; base grooves for accommodating the stopping arms are formed in the base; the straight arms are accommodated by the planes above the base grooves; a U-shaped groove is formed between the base groove; an oblique groove for clamping a lever is formed in the lug; rotating shafts on the two sides of the lug are arranged in the U-shaped groove; and two ends of the lever are placed in the round hole. The device is simple in unlocking action, can spring back automatically, and is suitable for a photoelectric module with the maximum height after rotation of a pull ring is limited.