The invention discloses a foldable baby carriage. The foldable baby carriage comprises a front frame, a rear frame and a push rod which are connected together through folding joints. A front wheel assembly and a rear wheel assembly are arranged on the front frame and the rear frame respectively. Each folding joint comprises a first connector arranged on the front frame, a base arranged on the rear frame and a second connector arranged on the push rod. The first connectors and the second connectors are arranged on the bases respectively in a pivoted manner, a plurality of first transmission teeth are arranged on the first connectors, and a plurality of second transmission teeth matching with the first transmission teeth are arranged on the second connectors. A mounting groove is formed in each second connector, and a locking spring and a locking pin are arranged in each mounting groove, and a locking groove is formed in each first connector. When the first connector and the second connector rotate to a certain angle, the mounting grooves and the locking grooves are collinearly aligned and communicated. Shifting blocks and first brake cables are arranged on the push rod, and the shifting block match the locking pins. The foldable baby carriage is simple in structure and convenient to operate, and the safety of infants can be effectively guaranteed.