Abstract: A connection block is revealed. The connection block includes a main body, at least two sleeve joint segments extending from a periphery of the main body, and at least one reinforcement part set between the main body and the sleeve joint segment. The sleeve joint segment is disposed with at least one slot. Thereby the connection block is stronger, not damaged or cracked easily. When the connection block and a pipe are connected, the sleeve joint segment is compressed a bit due to the slot and then is connected to an inner surface of the pipe securely by a recovery force of the sleeve joint segment. The assembling is easier and the connection is more stable. The connection block is with better practical value.