Abstract: A collapsible baby carriage includes a pair of middle pushing rod, a pair of upper pushing rod, a pair of T-rod, a pair of front wheel rod, a pair of bending-extension rod, a pair of side sliding rod, a pair of handle and a pair of seat side bending rod at two sides thereof. A top pushing rod, a seat bottom rod, a bottom connecting rod, a front wheel bottom rod and a rear wheel bottom rod are also between two sides of the baby carriage. The baby carriage includes a folding mechanism. The folding mechanism turns the upper pushing rod upward and the middle pushing rod and the front wheel rod downward. The flipping mechanism flips the seat side bending rods, the bending-extension rods, the front wheel rods, the front wheels, the handles, the T-rods and the rear wheels inward, forming a flat and rectangular body.