The invention discloses a wall-through detection radar capable of being handheld by a single person, and relates to miniature design of overall structure of radars. Especially, under the condition of meeting the requirement on radar strength, the mass and the size of the radar are reduced, and the production cost is lowered. The overall layout structure form of all parts of the radar and the shape form of the radar are optimized. A radar antenna is enabled to be very flexible to fold and unfold through design of a left antenna, a right antenna, a track, a left sliding block, a right sliding block, a left ball plunger and a right ball plunger. According to the invention, by adopting an appropriate process means, a radar which is light in weight and small in size, has big detection power and can be conveniently handheld by a single operation in operation can be manufactured.