Foldable bicycle pedal crank

A foldable bicycle pedal crank, comprising:

• a crank with a connecting yoke at a distal end, said yoke comprises a first crank hole and second crank holes passing therethrough,
• a crank endpiece comprising an insertion part that is received in said yoke, said crank endpiece having a first hole, second holes, and a third hole passing through said insertion part,
• a pedal connected to said crank endpiece, and
• a lock;
• wherein said lock comprises
• a lock body,
• at least one hollow first bolt which has an outer end connected to said lock body, an inner space of said first bolt towards an inner end comprises a limiting step, and said inner space accommodates a rod that passes through said first bolt and is fixed in position, with a spring surrounding said rod, abutting said limiting step, said rod includes a threaded portion that extends through said first bolt, said threaded portion allowing said rod to be secured by a nut, said nut including a cavity to receive said inner end of said first bolt, and
• second bolts which have outer ends connected to said lock body.