Container locking device and piggyback transport vehicle

A container locking device, comprising:

• a support, being provided with an accommodating space;
• a locking structure, a first end of the locking structure being hinged with the support, the locking structure having a locking position extending out of the accommodating space and an avoiding position retracted into the accommodating space;
• and
• a support structure, a first end of the support structure being hinged with a second end of the locking structure;
• wherein in a direction away from the locking structure, the support structure has a retraction position and a support position which cooperates with the support;
• when the locking structure is located at the locking position, the support structure is located at the support position and the locking structure is caused to stay at the locking position;
• and when the locking structure is located at the avoiding position, the support structure is located at the retraction position and is retracted into the accommodating space;
• the support is provided with a clamping groove in communication with the accommodating space, and the clamping groove is located below the first end of the support structure;
• and
• when the support structure is located at the support position, a second end of the support structure is snap-fitted with the clamping groove, and the first end of the locking structure, the first end of the support structure and the second end of the support structure form a triangle.